slice-species.js - mozsearch

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// |reftest| shell-option(--enable-float16array)

for (var constructor of typedArrayConstructors) {

    // Basic tests for our SpeciesConstructor implementation.

    var undefConstructor = new constructor(2);

    undefConstructor.constructor = undefined;

    assertDeepEq(undefConstructor.slice(1), new constructor(1));

    assertThrowsInstanceOf(() => {

        var strConstructor = new constructor;

        strConstructor.constructor = "not a constructor";

        strConstructor.slice(123);

    }, TypeError, "Assert that we have an invalid constructor");

    // If obj.constructor[@@species] is undefined or null then the default

    // constructor is used.

    var mathConstructor = new constructor(8);

    mathConstructor.constructor = Math.sin;

    assertDeepEq(mathConstructor.slice(4), new constructor(4));

    var undefSpecies = new constructor(2);

    undefSpecies.constructor = { [Symbol.species]: undefined };

    assertDeepEq(undefSpecies.slice(1), new constructor(1));

    var nullSpecies = new constructor(2);

    nullSpecies.constructor = { [Symbol.species]: null };

    assertDeepEq(nullSpecies.slice(1), new constructor(1));

    // If obj.constructor[@@species] is different constructor, it should be

    // used.

    for (var constructor2 of typedArrayConstructors) {

        var modifiedConstructor = new constructor(2);

        modifiedConstructor.constructor = constructor2;

        assertDeepEq(modifiedConstructor.slice(1), new constructor2(1));

        var modifiedSpecies = new constructor(2);

        modifiedSpecies.constructor = { [Symbol.species]: constructor2 };

        assertDeepEq(modifiedSpecies.slice(1), new constructor2(1));

    // If obj.constructor[@@species] is neither undefined nor null, and it's

    // not a constructor, TypeError should be thrown.

    assertThrowsInstanceOf(() => {

        var strSpecies = new constructor;

        strSpecies.constructor = { [Symbol.species]: "not a constructor" };

        strSpecies.slice(123);

    }, TypeError);

if (typeof reportCompare === "function")

    reportCompare(true, true);