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

title, tags, expertise, firstSeen, lastUpdated

title	tags	expertise	firstSeen	lastUpdated
Prepend function arguments	function	intermediate	2018-01-24T14:40:16+02:00	2020-09-15T16:28:04+03:00

Creates a function that invokes fn with partials prepended to the arguments it receives.

• Use the spread operator (...) to prepend partials to the list of arguments of fn.

const partial = (fn, ...partials) => (...args) => fn(...partials, ...args);

const greet = (greeting, name) => greeting + ' ' + name + '!';
const greetHello = partial(greet, 'Hello');
greetHello('John'); // 'Hello John!'