ts-prime/dist/commonjs/once.js

A utility library for JavaScript and Typescript.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Creates a function that is restricted to invoking `func` once. Repeat calls to the function return the value of the first invocation.
 * @param fn the function to wrap
 * @signature P.once(fn)
 * @example
 * const initialize = P.once(createApplication);
 * initialize();
 * initialize();
 * // => `createApplication` is invoked once
 * @category Function
 */
function once(fn) {
    var called = false;
    var ret;
    return function () {
        if (!called) {
            ret = fn();
            called = true;
        }
        return ret;
    };
}
exports.once = once;