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Generate randomized new array from a given array
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| // normal version | |
| const random = ([...arr]) => { | |
| let rand; | |
| for (let i = 0; i < arr.length; i++) { | |
| rand = Math.floor(Math.random() * (arr.length - i) + i); | |
| [arr[i], arr[rand]] = [arr[rand], arr[i]]; | |
| } | |
| return arr; | |
| } | |
| // optimized version | |
| const randomizeOptimized = ([...arr]) => { | |
| const len = arr.length; | |
| for (let i = 0; i < Math.ceil(len / 2); i++) { | |
| const rand = Math.floor(Math.random() * (len - i) + i); | |
| [arr[i], arr[rand]] = [arr[rand], arr[i]]; | |
| } | |
| return arr; | |
| } | |
| const arr = [1,2,3,4,5,6,7,8,9,10]; | |
| const result = random(arr); | |
| console.log(result); |
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