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for vs forEach
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var fns = []; | |
var arr = [1,2,3]; | |
for (var idx in arr) { | |
fns[idx] = function() { return idx }; | |
}; | |
console.log(fns[0]()); // 2 | |
console.log(fns[1]()); // 2 | |
console.log(fns[2]()); // 2 | |
arr.forEach(function(x, idx){ | |
fns[idx] = function() { return idx }; | |
}); | |
console.log(fns[0]()); // 0 | |
console.log(fns[1]()); // 1 | |
console.log(fns[2]()); // 2 | |
for (var idx in arr) { | |
(function(idx){ | |
fns[idx] = function() { return idx }; | |
})(idx); | |
}; | |
console.log(fns[0]()); // 0 | |
console.log(fns[1]()); // 1 | |
console.log(fns[2]()); // 2 |
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