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          September 27, 2021 12:41 
        
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    some zip implementations
  
        
  
    
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  | const zip = (...rows) => | |
| rows[0].map((_, i) => rows.map((row) => row[i])) | |
| const zip2 = (arr, ...arrs) => | |
| arr.map((val, i) => arrs.reduce((acc, cv) => [...acc, cv[i]], [val])) | |
| const zip3 = (...arrs) => { | |
| let r = [] | |
| for (let i = 0; i < arrs.length; i++) { | |
| for (let j = 0; j < arrs[i].length; j++) { | |
| if (!Array.isArray(r[j])) { | |
| r.push([]) | |
| } | |
| r[j].push(arrs[i][j]) | |
| } | |
| } | |
| return r | |
| }; | |
| zip(["a", "b"], [1, 2], [true, false]) // => [['a', 1, true], ['b', 2, false]] | 
  
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