head

Returns the head of an array.

Check if arr is truthy and has a length property.
Use arr[0] if possible to return the first element, otherwise return undefined.

const head = arr => (arr && arr.length ? arr[0] : undefined);

head([1, 2, 3]); // 1
head([]); // undefined
head(null); // undefined
head(undefined); // undefined

Last updated 15 September 2026 · Edit this page