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How to find the sum of an array of numbers with JavaScript?

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To find the sum of an array of numbers with JavaScript, we call the reduce method.

For instance we write

const sum = [1, 2, 3].reduce((partialSum, a) => partialSum + a, 0);
console.log(sum);

to call reduce with a function that returns the partialSum plus the number a in the array being looped through.

We set the initial value of partialSum to 0 with the 2nd argument.

The sum is returned and it’s 6.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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