rc-js-util/bin/esm/fp/impl/fp-once.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

/**
 * @public
 * Creates a function that can be called many times but will run at most once.
 *
 * @remarks
 * See {@link fpOnce}.
 */
export function fpOnce(initialize) {
    let item;
    let initialized = false;
    return (...args) => {
        if (initialized) {
            return item;
        }
        initialized = true;
        return item = initialize(...args);
    };
}
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