from_realms.js - mozsearch

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/ */

if (typeof newGlobal === 'function') {

    // G.Array.from, where G is any global, produces an array whose prototype

    // is G.Array.prototype.

    var g = newGlobal();

    var ga = g.Array.from([1, 2, 3]);

    assertEq(ga instanceof g.Array, true);

    // Even if G.Array is not passed in as the 'this' value to the call.

    var from = g.Array.from

    var ga2 = from([1, 2, 3]);

    assertEq(ga2 instanceof g.Array, true);

    // Array.from can be applied to a constructor from another realm.

    var p = Array.from.call(g.Array, [1, 2, 3]);

    assertEq(p instanceof g.Array, true);

    var q = g.Array.from.call(Array, [3, 4, 5]);

    assertEq(q instanceof Array, true);

    // The default 'this' value received by a non-strict mapping function is

    // that function's global, not Array.from's global or the caller's global.

    var h = newGlobal(), result = undefined;

    h.mainGlobal = this;

    h.eval("function f() { mainGlobal.result = this; }");

    g.Array.from.call(Array, [5, 6, 7], h.f);

    // (Give each global in the test a name, for better error messages.  But use

    // globalName, because window.name is complicated.)

    this.globalName = "main";

    g.globalName = "g";

    h.globalName = "h";

    assertEq(result.globalName, "h");

if (typeof reportCompare === 'function')

    reportCompare(0, 0);