WeakMap-constructor-duplicates.js (565B)
1 // When the argument to WeakMap contains a key multiple times, the last value 2 // is retained. 3 4 var k1 = {}; 5 var v1 = 42; 6 var k2 = {}; 7 var v2 = 43; 8 var k3 = {}; 9 var v3 = 44; 10 var k4 = {}; 11 12 var wrong1 = 8; 13 var wrong2 = 9; 14 var wrong3 = 10; 15 16 var arr = [[k1, wrong1], [k2, v2], [k3, wrong2], [k1, wrong3], [k3, v3], [k1, v1]]; 17 18 var m = new WeakMap(arr); 19 20 assertEq(m.has(k1), true); 21 assertEq(m.has(k2), true); 22 assertEq(m.has(k3), true); 23 assertEq(m.has(k4), false); 24 assertEq(m.get(k1), v1); 25 assertEq(m.get(k2), v2); 26 assertEq(m.get(k3), v3); 27 assertEq(m.get(k4), undefined);