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

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Array sum	math,array	blog_images/lake-trees.jpg	2017-12-29T13:29:49+02:00	2020-10-22T20:24:30+03:00

Calculates the sum of two or more numbers/arrays.

• Use Array.prototype.reduce() to add each value to an accumulator, initialized with a value of 0.

const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);

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