WeakMap-constructor-3.js

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// WeakMap can take an argument that is an array of singleton arrays.

var k1 = {};

var k2 = {};

var k3 = {};

var arr = [[k1], [k2]];

var m = new WeakMap(arr);

assertEq(m.has(k1), true);

assertEq(m.has(k2), true);

assertEq(m.has(k3), false);

assertEq(m.get(k1), undefined);

assertEq(m.get(k2), undefined);

assertEq(m.get(k3), undefined);

var arraylike1 = {

  0: k1,

  1: undefined

};

var arraylike2 = {

  0: k2,

};

arr = [arraylike1, arraylike2];

m = new WeakMap(arr);

assertEq(m.has(k1), true);

assertEq(m.has(k2), true);

assertEq(m.has(k3), false);

assertEq(m.get(k1), undefined);

assertEq(m.get(k2), undefined);

assertEq(m.get(k3), undefined);