// ♓🌟 Piscēs ∷ numeric.js
// ====================================================================
//
-// Copyright © 2022 Lady [@ Lady’s Computer].
+// Copyright © 2022–2023 Lady [@ Lady’s Computer].
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
-import { call } from "./function.js";
+import { call, createArrowFunction } from "./function.js";
+import { defineOwnDataProperty } from "./object.js";
import {
stringCatenate,
stringPadEnd,
substring,
toString,
} from "./string.js";
-import { sameValue, toPrimitive } from "./value.js";
-
-export const {
- /**
- * ln(10).
- *
- * ※ This is an alias for Math.LN10.
- */
- LN10,
-
- /**
- * ln(2).
- *
- * ※ This is an alias for Math.LN2.
- */
- LN2,
-
- /**
- * log10(ℇ).
- *
- * ※ This is an alias for Math.LOG10E.
- */
- LOG10E: LOG10ℇ,
-
- /**
- * log2(ℇ).
- *
- * ※ This is an alias for Math.LOG2E.
- */
- LOG2E: LOG2ℇ,
-
- /**
- * sqrt(.5).
- *
- * ※ This is an alias for Math.SQRT1_2.
- */
- SQRT1_2: RECIPROCAL_SQRT2,
-
- /**
- * sqrt(2).
- *
- * ※ This is an alias for Math.SQRT2.
- */
- SQRT2,
-
- /**
- * Returns the arccos of the provided value.
- *
- * ※ This is an alias for Math.acos.
- *
- * ☡ This function does not allow big·int arguments.
- */
- acos: arccos,
-
- /**
- * Returns the arccosh of the provided value.
- *
- * ※ This is an alias for Math.acosh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- acosh: arccosh,
-
- /**
- * Returns the arcsin of the provided value.
- *
- * ※ This is an alias for Math.asin.
- *
- * ☡ This function does not allow big·int arguments.
- */
- asin: arcsin,
-
- /**
- * Returns the arcsinh of the provided value.
- *
- * ※ This is an alias for Math.asinh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- asinh: arcsinh,
-
- /**
- * Returns the arctan of the provided value.
- *
- * ※ This is an alias for Math.atan.
- *
- * ☡ This function does not allow big·int arguments.
- */
- atan: arctan,
-
- /**
- * Returns the arctanh of the provided value.
- *
- * ※ This is an alias for Math.atanh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- atanh: arctanh,
-
- /**
- * Returns the cube root of the provided value.
- *
- * ※ This is an alias for Math.cbrt.
- *
- * ☡ This function does not allow big·int arguments.
- */
- cbrt,
-
- /**
- * Returns the ceiling of the provided value.
- *
- * ※ This is an alias for Math.ceil.
- *
- * ☡ This function does not allow big·int arguments.
- */
- ceil,
-
- /**
- * Returns the cos of the provided value.
- *
- * ※ This is an alias for Math.cos.
- *
- * ☡ This function does not allow big·int arguments.
- */
- cos,
-
- /**
- * Returns the cosh of the provided value.
- *
- * ※ This is an alias for Math.cosh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- cosh,
-
- /**
- * Returns the Euler number raised to the provided value.
- *
- * ※ This is an alias for Math.exp.
- *
- * ☡ This function does not allow big·int arguments.
- */
- exp,
-
- /**
- * Returns the Euler number raised to the provided value, minus one.
- *
- * ※ This is an alias for Math.expm1.
- *
- * ☡ This function does not allow big·int arguments.
- */
- expm1,
-
- /**
- * Returns the floor of the provided value.
- *
- * ※ This is an alias for Math.floor.
- *
- * ☡ This function does not allow big·int arguments.
- */
- floor,
-
- /**
- * Returns the square root of the sum of the squares of the provided
- * arguments.
- *
- * ※ This is an alias for Math.hypot.
- *
- * ☡ This function does not allow big·int arguments.
- */
- hypot,
-
- /**
- * Returns the ln of the provided value.
- *
- * ※ This is an alias for Math.log.
- *
- * ☡ This function does not allow big·int arguments.
- */
- log: ln,
-
- /**
- * Returns the log10 of the provided value.
- *
- * ※ This is an alias for Math.log10.
- *
- * ☡ This function does not allow big·int arguments.
- */
- log10,
-
- /**
- * Returns the ln of one plus the provided value.
- *
- * ※ This is an alias for Math.log1p.
- *
- * ☡ This function does not allow big·int arguments.
- */
- log1p: ln1p,
-
- /**
- * Returns the log2 of the provided value.
- *
- * ※ This is an alias for Math.log2.
- *
- * ☡ This function does not allow big·int arguments.
- */
- log2,
-
- /**
- * Returns a pseudo·random value in the range [0, 1).
- *
- * ※ This is an alias for Math.random.
- */
- random: rand,
-
- /**
- * Returns the round of the provided value.
- *
- * ※ This is an alias for Math.round.
- *
- * ☡ This function does not allow big·int arguments.
- */
- round,
-
- /**
- * Returns the sinh of the provided value.
- *
- * ※ This is an alias for Math.sinh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- sinh,
-
- /**
- * Returns the square root of the provided value.
- *
- * ※ This is an alias for Math.sqrt.
- *
- * ☡ This function does not allow big·int arguments.
- */
- sqrt,
-
- /**
- * Returns the tan of the provided value.
- *
- * ※ This is an alias for Math.tan.
- *
- * ☡ This function does not allow big·int arguments.
- */
- tan,
-
- /**
- * Returns the tanh of the provided value.
- *
- * ※ This is an alias for Math.tanh.
- *
- * ☡ This function does not allow big·int arguments.
- */
- tanh,
-
- /**
- * Returns the trunc of the provided value.
- *
- * ※ This is an alias for Math.trunc.
- *
- * ☡ This function does not allow big·int arguments.
- */
- trunc,
-
- /**
- * The mathematical constant π.
- *
- * ※ This is an alias for Math.PI.
- */
- PI: Π,
-
- /**
- * The Euler number.
- *
- * ※ This is an alias for Math.E.
- */
- E: ℇ,
-} = Math;
-
-export const {
- /**
- * The largest number value less than infinity.
- *
- * ※ This is an alias for Number.MAX_VALUE.
- */
- MAX_VALUE: MAXIMUM_NUMBER,
-
- /**
- * 2**53 - 1.
- *
- * ※ This is an alias for Number.MAX_SAFE_INTEGER.
- */
- MAX_SAFE_INTEGER: MAXIMUM_SAFE_INTEGRAL_NUMBER,
-
- /**
- * The smallest number value greater than negative infinity.
- *
- * ※ This is an alias for Number.MIN_VALUE.
- */
- MIN_VALUE: MINIMUM_NUMBER,
-
- /**
- * -(2**53 - 1).
- *
- * ※ This is an alias for Number.MIN_SAFE_INTEGER.
- */
- MIN_SAFE_INTEGER: MINIMUM_SAFE_INTEGRAL_NUMBER,
-
- /**
- * Negative infinity.
- *
- * ※ This is an alias for Number.NEGATIVE_INFINITY.
- */
+import {
+ NAN,
NEGATIVE_INFINITY,
-
- /**
- * Nan.
- *
- * ※ This is an alias for Number.NaN.
- */
- NaN: NAN,
-
- /**
- * Positive infinity.
- *
- * ※ This is an alias for Number.POSITIVE_INFINITY.
- */
POSITIVE_INFINITY,
-
- /**
- * The difference between 1 and the smallest number greater than 1.
- *
- * ※ This is an alias for Number.EPSILON.
- */
- EPSILON: Ε,
-
- /**
- * Returns whether the provided value is a finite number.
- *
- * ※ This is an alias for Number.isFinite.
- */
- isFinite: isFiniteNumber,
-
- /**
- * Returns whether the provided value is an integral number.
- *
- * ※ This is an alias for Number.isInteger.
- */
- isInteger: isIntegralNumber,
-
- /**
- * Returns whether the provided value is nan.
- *
- * ※ This is an alias for Number.isNaN.
- */
- isNaN: isNan,
-
- /**
- * Returns whether the provided value is a safe integral number.
- *
- * ※ This is an alias for Number.isSafeInteger.
- */
- isSafeInteger: isSafeIntegralNumber,
-} = Number;
-
-/** Positive zero. */
-export const POSITIVE_ZERO = 0;
-
-/** Negative zero. */
-export const NEGATIVE_ZERO = -0;
+ sameValue,
+ toPrimitive,
+ UNDEFINED,
+} from "./value.js";
/**
* Returns the magnitude (absolute value) of the provided value.
*
- * ※ Unlike Math.abs, this function can take big·int arguments.
+ * ※ Unlike `Math.abs`, this function can take big·int arguments.
*/
export const abs = ($) => {
const n = toNumeric($);
: n;
};
+/**
+ * Returns the arccos of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.acos`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arccos = createArrowFunction(
+ Math.acos,
+ { name: "arccos" },
+);
+
+/**
+ * Returns the arccosh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.acosh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arccosh = createArrowFunction(
+ Math.acosh,
+ { name: "arccosh" },
+);
+
+/**
+ * Returns the arcsin of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.asin`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arcsin = createArrowFunction(
+ Math.asin,
+ { name: "arcsin" },
+);
+
+/**
+ * Returns the arcsinh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.asinh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arcsinh = createArrowFunction(
+ Math.asinh,
+ { name: "arcsinh" },
+);
+
+/**
+ * Returns the arctan of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.atan`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arctan = createArrowFunction(
+ Math.atan,
+ { name: "arctan" },
+);
+
export const {
/**
* Returns the arctangent of the dividend of the provided values.
*
- * ※ Unlike Math.atan2, this function can take big·int arguments.
+ * ※ Unlike `Math.atan2`, this function can take big·int arguments.
* However, the result will always be a number.
*/
- atan2,
+ arctan2,
/**
- * Returns the number of leading zeroes in the 32‐bit representation of
- * the provided value.
+ * Returns the number of leading zeroes in the 32‐bit representation
+ * of the provided value.
*
- * ※ Unlike Math.clz32, this function accepts either number or big·int
- * values.
+ * ※ Unlike `Math.clz32`, this function accepts either number or
+ * big·int values.
*/
clz32,
* Returns the 32‐bit float which best approximate the provided
* value.
*
- * ※ Unlike Math.fround, this function can take big·int arguments.
+ * ※ Unlike `Math.fround`, this function can take big·int arguments.
* However, the result will always be a number.
*/
toFloat32,
} = (() => {
const { atan2, fround, clz32 } = Math;
return {
- atan2: (y, x) => atan2(toNumber(y), toNumber(x)),
+ arctan2: (y, x) => atan2(toNumber(y), toNumber(x)),
clz32: ($) => {
const n = toNumeric($);
return clz32(
- typeof n === "bigint" ? toNumber(toUintN(32, n)) : n,
+ typeof n === "bigint"
+ ? toNumber(toUnsignedIntegralNumeric(32, n))
+ : n,
);
},
toFloat32: ($) => fround(toNumber($)),
};
})();
+/**
+ * Returns the arctanh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.atanh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const arctanh = createArrowFunction(
+ Math.atanh,
+ { name: "arctanh" },
+);
+
+/**
+ * Returns the cube root of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.cbrt`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const cbrt = createArrowFunction(Math.cbrt);
+
+/**
+ * Returns the ceiling of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.ceil`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const ceil = createArrowFunction(Math.ceil);
+
+/**
+ * Returns the cos of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.cos`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const cos = createArrowFunction(Math.cos);
+
+/**
+ * Returns the cosh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.cosh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const cosh = createArrowFunction(Math.cosh);
+
+/**
+ * Returns the Euler number raised to the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.exp`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const exp = createArrowFunction(Math.exp);
+
+/**
+ * Returns the Euler number raised to the provided value, minus one.
+ *
+ * ※ This function is effectively an alias for `Math.expm1`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const expm1 = createArrowFunction(Math.expm1);
+
+/**
+ * Returns the floor of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.floor`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const floor = createArrowFunction(Math.floor);
+
+/**
+ * Returns the square root of the sum of the squares of the provided
+ * arguments.
+ *
+ * ※ This function is effectively an alias for `Math.hypot`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const hypot = createArrowFunction(Math.hypot);
+
+/**
+ * Returns whether the provided value is a finite number.
+ *
+ * ※ This function is effectively an alias for `Number.isFinite`.
+ */
+export const isFiniteNumber = createArrowFunction(
+ Number.isFinite,
+ { name: "isFiniteNumber" },
+);
+
+/**
+ * Returns whether the provided value is an integral number.
+ *
+ * ※ This function is effectively an alias for `Number.isInteger`.
+ */
+export const isIntegralNumber = createArrowFunction(
+ Number.isInteger,
+ { name: "isIntegralNumber" },
+);
+
+/**
+ * Returns whether the provided value is nan.
+ *
+ * ※ This function is effectively an alias for `Number.isNaN`.
+ */
+export const isNan = createArrowFunction(
+ Number.isNaN,
+ { name: "isNan" },
+);
+
+/**
+ * Returns whether the provided value is a safe integral number.
+ *
+ * ※ This function is effectively an alias for `Number.isSafeInteger`.
+ */
+export const isSafeIntegralNumber = createArrowFunction(
+ Number.isSafeInteger,
+ { name: "isSafeIntegralNumber" },
+);
+
+/**
+ * Returns the ln of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.log`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const ln = createArrowFunction(Math.log, { name: "ln" });
+
+/**
+ * Returns the ln of one plus the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.log1p`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const ln1p = createArrowFunction(Math.log1p, { name: "ln1p" });
+
+/**
+ * Returns the log10 of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.log10`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const log10 = createArrowFunction(Math.log10);
+
+/**
+ * Returns the log2 of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.log2`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const log2 = createArrowFunction(Math.log2);
+
/**
* Returns the highest value of the provided arguments, or negative
* infinity if no argument is provided.
*
- * ※ Unlike Math.max, this function accepts either number or big·int
+ * ※ Unlike `Math.max`, this function accepts either number or big·int
* values. All values must be of the same type, or this function will
* throw an error.
*
* ☡ If no argument is supplied, the result will be a number, not a
* big·int.
*/
-export const max = (...$s) => {
- let highest = undefined;
+export const max = Object.defineProperties((...$s) => {
+ let highest = UNDEFINED;
for (let i = 0; i < $s.length; ++i) {
// Iterate over all the numbers.
const number = toNumeric($s[i]);
- if (highest === undefined) {
+ if (highest === UNDEFINED) {
// The current number is the first one.
if (isNan(number)) {
// The current number is nan.
} else if (sameValue(number, 0) && sameValue(highest, -0)) {
// The current number is +0 and the highest number is -0.
highest = 0;
- } else if (highest === undefined || number > highest) {
+ } else if (number > highest) {
// The current number is greater than the highest number.
highest = number;
} else {
}
}
return highest ?? NEGATIVE_INFINITY;
-};
+}, {
+ name: defineOwnDataProperty(Object.create(null), "value", "max"),
+ length: defineOwnDataProperty(Object.create(null), "value", 2),
+});
/**
* Returns the lowest value of the provided arguments, or positive
* infinity if no argument is provided.
*
- * ※ Unlike Math.min, this function accepts either number or big·int
+ * ※ Unlike `Math.min`, this function accepts either number or big·int
* values. All values must be of the same type, or this function will
* throw an error.
*
* ☡ If no argument is supplied, the result will be a number, not a
* big·int.
*/
-export const min = (...$s) => {
- let lowest = undefined;
+export const min = Object.defineProperties((...$s) => {
+ let lowest = UNDEFINED;
for (let i = 0; i < $s.length; ++i) {
// Iterate over all the numbers.
const number = toNumeric($s[i]);
- if (lowest === undefined) {
+ if (lowest === UNDEFINED) {
// The current number is the first one.
if (isNan(number)) {
// The current number is nan.
}
}
return lowest ?? POSITIVE_INFINITY;
-};
+}, {
+ name: defineOwnDataProperty(Object.create(null), "value", "min"),
+ length: defineOwnDataProperty(Object.create(null), "value", 2),
+});
+
+/**
+ * Returns a pseudo·random value in the range [0, 1).
+ *
+ * ※ This function is effectively an alias for `Math.random`.
+ */
+export const rand = createArrowFunction(
+ Math.random,
+ { name: "rand" },
+);
+
+/**
+ * Returns the round of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.round`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const round = createArrowFunction(Math.round);
/**
* Returns a unit value with the same sign as the provided value, or
* signed) zero.
*
* For big·ints, the return value of this function is 0n if the
- * provided value is 0n, -1n if the provided value is negative, and +1n
+ * provided value is 0n, −1n if the provided value is negative, and +1n
* otherwise.
*
- * For numbers, the return value is nan, -0, or +0 if the provided
- * value is nan, -0, or +0, respectively, and -1 if the provided value
+ * For numbers, the return value is nan, −0, or +0 if the provided
+ * value is nan, −0, or +0, respectively, and −1 if the provided value
* is negative and +1 if the provided value is positive otherwise. Note
- * that positive and negative infinity will return +1 and -1
+ * that positive and negative infinity will return +1 and −1
* respectively.
*
- * ※ Unlike Math.sign, this function accepts either number or big·int
- * values.
+ * ※ Unlike `Math.sign`, this function accepts either number or
+ * big·int values.
*/
export const sgn = ($) => {
const n = toNumeric($);
: 1;
};
+/**
+ * Returns the sin of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.sin`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const sin = createArrowFunction(Math.sin);
+
+/**
+ * Returns the sinh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.sinh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const sinh = createArrowFunction(Math.sinh);
+
+/**
+ * Returns the square root of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.sqrt`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const sqrt = createArrowFunction(Math.sqrt);
+
+/**
+ * Returns the tan of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.tan`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const tan = createArrowFunction(Math.tan);
+
+/**
+ * Returns the tanh of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.tanh`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const tanh = createArrowFunction(Math.tanh);
+
/**
* Returns the result of converting the provided value to a big·int.
*
* ※ This method is safe to use with numbers.
*
- * ※ This is effectively an alias for BigInt.
+ * ※ This is effectively an alias for `BigInt`.
*/
export const { toBigInt } = (() => {
const makeBigInt = BigInt;
return call(
numberToExponential,
n,
- [fractionDigits === undefined ? fractionDigits : f],
+ [fractionDigits === UNDEFINED ? fractionDigits : f],
);
} else {
const digits = call(bigintToString, n, [10]);
const { length } = digits;
- if (fractionDigits === undefined) {
+ if (fractionDigits === UNDEFINED) {
return length === 1
? `${digits[0]}e+0`
: `${digits[0]}.${substring(digits, 1)}e+${length - 1}`;
};
})();
-export const {
- /**
- * Returns the result of converting the provided value to fit within
- * the provided number of bits as a signed integer.
- *
- * ※ Unlike BigInt.asIntN, this function accepts both big·int and
- * number values.
- *
- * ☡ The first argument, the number of bits, must be a number.
- */
- toIntN,
-
- /**
- * Returns the result of converting the provided value to fit within
- * the provided number of bits as an unsigned integer.
- *
- * ※ Unlike BigInt.asUintN, this function accepts both big·int and
- * number values.
- *
- * ☡ The first argument, the number of bits, must be a number.
- */
- toUintN,
-} = (() => {
- const { asIntN, asUintN } = BigInt;
- return {
- toIntN: (n, $) => {
- const prim = toPrimitive($);
- if (typeof prim === "bigint") {
- // The primitive value is a big·int.
- return asIntN(n, prim);
- } else {
- // The primitive value is not a big·int.
- const int = trunc(prim);
- if (!isFiniteNumber(int) || int == 0) {
- // The truncated value is zero or not finite.
- return 0;
- } else {
- // The truncated value is finite.
- return toNumber(asIntN(n, toBigInt(int)));
- }
- }
- },
- toUintN: (n, $) => {
- const prim = toPrimitive($);
- if (typeof prim === "bigint") {
- // The primitive value is a big·int.
- return asUintN(n, prim);
- } else {
- // The primitive value is not a big·int.
- const int = trunc(prim);
- if (!isFiniteNumber(int) || int == 0) {
- // The truncated value is zero or not finite.
- return 0;
- } else {
- // The truncated value is finite.
- return toNumber(asUintN(n, toBigInt(int)));
- }
- }
- },
- };
-})();
-
/**
* Returns the result of converting the provided number to an integral
* number.
*
* ※ This function is safe to use with big·ints.
*
- * ※ This is effectively a nonconstructible version of the Number
+ * ※ This is effectively a nonconstructible version of the `Number`
* constructor.
*/
export const { toNumber } = (() => {
const primValue = toPrimitive($, "number");
return typeof primValue === "bigint" ? primValue : +primValue;
};
+
+export const {
+ /**
+ * Returns the result of converting the provided value to fit within
+ * the provided number of bits as a signed integer.
+ *
+ * ※ Unlike `BigInt.asIntN`, this function accepts both big·int and
+ * number values.
+ *
+ * ☡ The first argument, the number of bits, must be a number.
+ */
+ toSignedIntegralNumeric,
+
+ /**
+ * Returns the result of converting the provided value to fit within
+ * the provided number of bits as an unsigned integer.
+ *
+ * ※ Unlike `BigInt.asUintN`, this function accepts both big·int and
+ * number values.
+ *
+ * ☡ The first argument, the number of bits, must be a number.
+ */
+ toUnsignedIntegralNumeric,
+} = (() => {
+ const { asIntN, asUintN } = BigInt;
+ return {
+ toSignedIntegralNumeric: (n, $) => {
+ const prim = toPrimitive($);
+ if (typeof prim === "bigint") {
+ // The primitive value is a big·int.
+ return asIntN(n, prim);
+ } else {
+ // The primitive value is not a big·int.
+ const int = trunc(prim);
+ if (!isFiniteNumber(int) || int == 0) {
+ // The truncated value is zero or not finite.
+ return 0;
+ } else {
+ // The truncated value is finite.
+ return toNumber(asIntN(n, toBigInt(int)));
+ }
+ }
+ },
+ toUnsignedIntegralNumeric: (n, $) => {
+ const prim = toPrimitive($);
+ if (typeof prim === "bigint") {
+ // The primitive value is a big·int.
+ return asUintN(n, prim);
+ } else {
+ // The primitive value is not a big·int.
+ const int = trunc(prim);
+ if (!isFiniteNumber(int) || int == 0) {
+ // The truncated value is zero or not finite.
+ return 0;
+ } else {
+ // The truncated value is finite.
+ return toNumber(asUintN(n, toBigInt(int)));
+ }
+ }
+ },
+ };
+})();
+
+/**
+ * Returns the trunc of the provided value.
+ *
+ * ※ This function is effectively an alias for `Math.trunc`.
+ *
+ * ☡ This function does not allow big·int arguments.
+ */
+export const trunc = createArrowFunction(Math.trunc);
Lady’s Gitweb / Pisces / blobdiff