froebel/unary.mjs

TypeScript utility library

/**
 * Turns `fun` into a unary function (a function that only accepts one
 * argument).
 *
 * Note: `fun` must accept at least one argument and must not require more than
 * one argument.
 *
 * @example
 * ```
 * ['1', '2', '3'].map(unary(parseInt))  // -> [1, 2, 3]
 * ```
 */
const unary = fun => arg => fun(arg);

export default unary;