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

title, tags

title	tags
coalesceFactory	type,intermediate

Returns a customized coalesce function that returns the first argument that returns true from the provided argument validation function.

• Use Array.prototype.find() to return the first argument that returns true from the provided argument validation function.

const coalesceFactory = valid => (...args) => args.find(valid);

const customCoalesce = coalesceFactory(_ => ![null, undefined, '', NaN].includes(_));
customCoalesce(undefined, null, NaN, '', 'Waldo'); // "Waldo"