WeakMap-constructor-duplicates.js

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// When the argument to WeakMap contains a key multiple times, the last value

// is retained.

var k1 = {};

var v1 = 42;

var k2 = {};

var v2 = 43;

var k3 = {};

var v3 = 44;

var k4 = {};

var wrong1 = 8;

var wrong2 = 9;

var wrong3 = 10;

var arr = [[k1, wrong1], [k2, v2], [k3, wrong2], [k1, wrong3], [k3, v3], [k1, v1]];

var m = new WeakMap(arr);

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

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

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

assertEq(m.has(k4), false);

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

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

assertEq(m.get(k3), v3);

assertEq(m.get(k4), undefined);