toLocaleLowerCase.js

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// |reftest| skip-if(!this.hasOwnProperty("Intl"))

// Test language dependent special casing with different language tags.

for (let locale of ["tr", "TR", "tr-TR", "tr-u-co-search", "tr-x-turkish"]) {

    assertEq("\u0130".toLocaleLowerCase(locale), "i");

    assertEq("\u0130".toLocaleLowerCase([locale]), "i");

    // Additional language tags are ignored.

    assertEq("\u0130".toLocaleLowerCase([locale, "und"]), "i");

    assertEq("\u0130".toLocaleLowerCase(["und", locale]), "\u0069\u0307");

// Ensure "trl" (Traveller Scottish) isn't misrecognized as "tr", even though

// both share the same prefix.

assertEq("\u0130".toLocaleLowerCase("trl"), "\u0069\u0307");

assertEq("\u0130".toLocaleLowerCase(["trl"]), "\u0069\u0307");

// Language tag is always verified.

for (let locale of ["no_locale", "tr-invalid_ext", ["no_locale"], ["en", "no_locale"]]) {

    // Empty input string.

    assertThrowsInstanceOf(() => "".toLocaleLowerCase(locale), RangeError);

    // Non-empty input string.

    assertThrowsInstanceOf(() => "x".toLocaleLowerCase(locale), RangeError);

// No locale argument, undefined as locale, and empty array or array-like all

// return the same result. Testing with "a/A" because it has only simple case

// mappings.

assertEq("A".toLocaleLowerCase(), "a");

assertEq("A".toLocaleLowerCase(undefined), "a");

assertEq("A".toLocaleLowerCase([]), "a");

assertEq("A".toLocaleLowerCase({}), "a");

assertEq("A".toLocaleLowerCase({length: 0}), "a");

assertEq("A".toLocaleLowerCase({length: -1}), "a");

// Test with incorrect locale type.

for (let locale of [null, 0, Math.PI, NaN, Infinity, true, false, Symbol()]) {

    // Empty input string.

    assertThrowsInstanceOf(() => "".toLocaleLowerCase([locale]), TypeError);

    // Non-empty input string.

    assertThrowsInstanceOf(() => "A".toLocaleLowerCase([locale]), TypeError);

// Primitives are converted with ToObject and then queried for .length property.

for (let locale of [null]) {

    // Empty input string.

    assertThrowsInstanceOf(() => "".toLocaleLowerCase([locale]), TypeError);

    // Non-empty input string.

    assertThrowsInstanceOf(() => "A".toLocaleLowerCase([locale]), TypeError);

// ToLength(ToObject(<primitive>)) returns 0.

for (let locale of [0, Math.PI, NaN, Infinity, true, false, Symbol()]) {

    // Empty input string.

    assertEq("".toLocaleLowerCase(locale), "");

    // Non-empty input string.

    assertEq("A".toLocaleLowerCase(locale), "a");

if (typeof reportCompare === "function")

    reportCompare(0, 0, "ok");