sum

Returns 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.

typescript

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

typescript

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