30-seconds-of-code/snippets/accumulate.md

title, tags

title	tags
accumulate	math,array,beginner

Returns an array of partial sums.

Use Array.prototype.reduce(), Array.prototype.slice(-1) and the unary + operator to add each value to the unary array containing the previous sum.

const accumulate = (...nums) => nums.reduce((acc, n) => [...acc, n + +acc.slice(-1)],[]);

accumulate(1, 2, 3, 4); // [1, 3, 6, 10]
accumulate(...[1, 2, 3, 4]); // [1, 3, 6, 10]