WeakMap-constructor-2.js

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// The WeakMap constructor can take an argument that is an array of pairs.

var k1 = {};

var v1 = 42;

var k2 = {};

var v2 = 43;

var k3 = {};

var arr = [[k1, v1], [k2, v2]];

var m = new WeakMap(arr);

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

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

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

assertEq(m.get(k1), v1);

assertEq(m.get(k2), v2);

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

var arraylike1 = {

  0: k1,

  1: v1

};

var arraylike2 = {

  0: k2,

  1: v2

};

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), v1);

assertEq(m.get(k2), v2);

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