1 line of code: How to get the sum of an array of numbers

const sum = arr => arr.reduce((a, b) => a + b, 0);

Returns the sum of all items in a numerical array.

Beware of JavaScripts Automatic Type Conversion if your Array contains something else than Numbers.

The repository & npm package

You can find the all the utility functions from this series at github.com/martinkr/onelinecode
The library is also published to npm as @onelinecode for your convenience.

The code and the npm package will be updated every time I publish a new article.

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Comments

[Frank Wisniewski]

not really serious...

const sum = arr => eval(arr.join`+`)

[Martin Krause]

:D