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August 13, 2021 15:04
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Fun with Arrays
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| const sourceA = [ | |
| [ | |
| ...[...Array(5).keys()].map((value) => { | |
| return { ref: 'sourceA', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(13).keys()].map((value) => { | |
| return { ref: 'sourceB', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(22).keys()].map((value) => { | |
| return { ref: 'sourceC', value } | |
| }), | |
| ], | |
| ] | |
| const sourceB = [ | |
| [ | |
| ...[...Array(5).keys()].map((value) => { | |
| return { ref: 'sourceA', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(5).keys()].map((value) => { | |
| return { ref: 'sourceB', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(5).keys()].map((value) => { | |
| return { ref: 'sourceC', value } | |
| }), | |
| ], | |
| ] | |
| const sourceC = [ | |
| [ | |
| ...[...Array(1).keys()].map((value) => { | |
| return { ref: 'sourceA', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(0).keys()].map((value) => { | |
| return { ref: 'sourceB', value } | |
| }), | |
| ], | |
| [ | |
| ...[...Array(100).keys()].map((value) => { | |
| return { ref: 'sourceC', value } | |
| }), | |
| ], | |
| ] | |
| const roundRobinWithBreakAtDesiredLength = (arr, results, targetLength) => { | |
| if (arr.length === 0) return results | |
| const newResults = arr.reduce( | |
| (acc, current) => { | |
| if (current.length > 0 && acc.results.length < targetLength) { | |
| acc.results.push(current.shift()) | |
| acc.arr.push(current) | |
| } | |
| return acc | |
| }, | |
| { arr: [], results } | |
| ) | |
| return roundRobinWithBreakAtDesiredLength( | |
| newResults.arr, | |
| newResults.results, | |
| targetLength | |
| ) | |
| } | |
| function doStuff(source, targetLength) { | |
| const result = [] | |
| const s = JSON.parse(JSON.stringify(source)) // poor mans deep clone | |
| return roundRobinWithBreakAtDesiredLength(s, result, targetLength) | |
| } | |
| console.log(doStuff(sourceA, 20)) | |
| console.log(doStuff(sourceA, 20).length) | |
| console.log(doStuff(sourceB, 20)) | |
| console.log(doStuff(sourceB, 20).length) | |
| console.log(doStuff(sourceC, 20)) | |
| console.log(doStuff(sourceC, 20).length) |
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