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11 lines
185 B
JavaScript
11 lines
185 B
JavaScript
var arr = [1,2,3];
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arr.concat([1,2,3]); // NOT OK!
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arr.concat(arr); // NOT OK!
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console.log(arr.concat([1,2,3]));
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({concat: Array.prototype.concat}.concat(arr));
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[].concat([1,2,3]); |