Object.fromEntries vs Reduce (reuse object) vs Reduce (creating temporary objects) from list of data

flatMap vs filter map

flatMap vs filter map

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lodash flatMap vs lodash filter map

in a reduce(), is it better to push to the accumulator or return a spread of the accumulator with the new value in it

Compare the new ES6 spread operator with the traditional concat() method and push, with target array growing

Compare the new ES6 spread operator with the traditional slice() method