how to flatten array with reduce in javascript

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Alejandra
01 Jun 2018
1let flattened = [[0, 1], [2, 3], [4, 5]].reduce(
2  function(accumulator, currentValue) {
3    return accumulator.concat(currentValue)
4  },
5  []
6)
7// flattened is [0, 1, 2, 3, 4, 5]
8
source
Luigi
19 Sep 2018
1//note idx and sourceArray are optional
2const sum = array.reduce((accumulator, element[, idx[, sourceArray]]) => {
3	//arbitrary example of why idx might be needed
4	return accumulator + idx * 2 + element 
5}, 0);
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