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An array is an ordered data structure consisting of a collection of elements (values or variables), each identified by one (single dimensional array, or vector) or multiple indexes.
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Free Code Camp - Pairwise
This function implementation uses the "reduce" method to get the sum of the indexes and it fullfills all Free Code Camp tests.
function pairwise(arr, arg) {
return arr.reduce((sum, value1, index1) …