Set-forEach.js - mozsearch

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/* test Set.prototype.forEach */

load(libdir + 'asserts.js');

load(libdir + 'iteration.js');

// testing success conditions of Set.prototype.forEach

var testSet = new Set();

function callback(value, key, set) {

    assertEq(value, key);

    testSet.add(value);

    assertEq(set.has(key), true);

var initialSet = new Set(['a', 1, undefined]);

initialSet.forEach(callback);

// test that both the Sets are equal and are in same order

var iterator = initialSet[Symbol.iterator]();

var count = 0;

for (var v of testSet) {

    assertEq(initialSet.has(v), true);

    assertIteratorNext(iterator, v);

    count++;

//check both the Sets we have are equal in size

assertEq(initialSet.size, testSet.size);

assertEq(initialSet.size, count);

var x = { abc: 'test'};

function callback2(value, key, set) {

    assertEq(x, this);

initialSet = new Set(['a']);

initialSet.forEach(callback2, x);

// testing failure conditions of Set.prototype.forEach

var m = new Map([['a', 1], ['b', 2.3], ['c', undefined]]);

assertThrowsInstanceOf(function() {

    Set.prototype.forEach.call(m, callback);

}, TypeError, "Set.prototype.forEach should raise TypeError if not a used on a Set");

var fn = 2;

assertThrowsInstanceOf(function() {

    initialSet.forEach(fn);

}, TypeError, "Set.prototype.forEach should raise TypeError if callback is not a function");