key-equality-1.js (739B)
1 // Different representations of the same number or string are treated as the same Map key. 2 3 var m = new Map; 4 var test = function test(a, b) { 5 m.set(a, 'secret'); 6 assertEq(m.get(b), 'secret'); 7 m.set(b, 'password'); 8 assertEq(m.get(a), 'password'); 9 10 assertEq(a, b); 11 }; 12 13 // Float and integer representations of the same number are the same key. 14 test(9, Math.sqrt(81)); 15 16 // Ordinary strings and ropes are the same key. 17 var a = Array(1001).join('x'); 18 var b = Array(501).join('x') + Array(501).join('x'); 19 test(a, b); 20 21 // Two structurally different ropes with the same characters are the same key. 22 a = ""; 23 b = ""; 24 for (var i = 0; i < 10; i++) { 25 a = Array(501).join('x') + a; 26 b = b + Array(501).join('x'); 27 } 28 test(a, b);