-describe("isArrayIndexString", () => {
- it("[[Call]] returns false for nonstrings", () => {
- assertStrictEquals(isArrayIndexString(1), false);
- });
-
- it("[[Call]] returns false for noncanonical strings", () => {
- assertStrictEquals(isArrayIndexString(""), false);
- assertStrictEquals(isArrayIndexString("01"), false);
- assertStrictEquals(isArrayIndexString("9007199254740993"), false);
- });
-
- it("[[Call]] returns false for nonfinite numbers", () => {
- assertStrictEquals(isArrayIndexString("NaN"), false);
- assertStrictEquals(isArrayIndexString("Infinity"), false);
- assertStrictEquals(isArrayIndexString("-Infinity"), false);
- });
-
- it("[[Call]] returns false for negative numbers", () => {
- assertStrictEquals(isArrayIndexString("-0"), false);
- assertStrictEquals(isArrayIndexString("-1"), false);
- });
-
- it("[[Call]] returns false for nonintegers", () => {
- assertStrictEquals(isArrayIndexString("0.25"), false);
- assertStrictEquals(isArrayIndexString("1.1"), false);
- });
-
- it("[[Call]] returns false for numbers greater than or equal to -1 >>> 0", () => {
- assertStrictEquals(isArrayIndexString(String(-1 >>> 0)), false);
- assertStrictEquals(
- isArrayIndexString(String((-1 >>> 0) + 1)),
- false,
- );
- });
-
- it("[[Call]] returns true for array lengths less than -1 >>> 0", () => {
- assertStrictEquals(isArrayIndexString("0"), true);
- assertStrictEquals(
- isArrayIndexString(String((-1 >>> 0) - 1)),
- true,
- );
- });
-});
-
-describe("isArraylikeObject", () => {
- it("[[Call]] returns false for primitives", () => {
- assertStrictEquals(isArraylikeObject("failure"), false);
- });
-
- it("[[Call]] returns false if length throws", () => {
- assertStrictEquals(
- isArraylikeObject({
- get length() {
- throw void {};
- },
- }),
- false,
- );
- });
-
- it("[[Call]] returns false if length is not a number and cannot be converted to one", () => {
- assertStrictEquals(isArraylikeObject({ length: 1n }), false);
- });
-
- it("[[Call]] returns true if length is convertable to a number", () => {
- assertStrictEquals(isArraylikeObject({ length: -0 }), true);
- assertStrictEquals(isArraylikeObject({ length: 1 }), true);
- assertStrictEquals(isArraylikeObject({ length: -1.25 }), true);
- assertStrictEquals(
- isArraylikeObject({ length: 9007199254740992 }),
- true,
- );
- assertStrictEquals(isArraylikeObject({ length: Infinity }), true);
- assertStrictEquals(isArraylikeObject({ length: "success" }), true);
- });
-});
-