for-in.js - mozsearch

Enable keyboard shortcuts

// for-in loops on Maps and Sets enumerate properties.

var test = function test(obj) {

    assertEq(Object.keys(obj).length, 0);

    var i = 0, v;

    for (v in obj)

        i++;

    assertEq(i, 0);

    obj.ownProp = 1;

    assertEq(Object.keys(obj).join(), "ownProp");

    for (v in obj)

        i++;

    assertEq(i, 1);

    assertEq(v, "ownProp");

    delete obj.ownProp;

};

test(Map.prototype);

test(new Map);

test(Set.prototype);

test(new Set);