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Calculate the difference between two sets
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| /* it is in A but not in B */ | |
| function diff(arrA, arrB) { | |
| const mapB = arrB.reduce((res, b) => ({ ...res, [b.key]:b }), {}); | |
| return arrA.reduce((res, a) => !(a.key in mapB) ? [ ...res, a ] : res, []); | |
| } |
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