49 lines
1.1 KiB
JavaScript
49 lines
1.1 KiB
JavaScript
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"use strict";
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// Dependencies
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var Typpy = require("typpy");
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/**
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* Deffy
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* Computes a final value by providing the input and default values.
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*
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* @name Deffy
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* @function
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* @param {Anything} input The input value.
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* @param {Anything|Function} def The default value or a function getting the
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* input value as first argument.
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* @param {Object|Boolean} options The `empty` value or an object containing
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* the following fields:
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*
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* - `empty` (Boolean): Handles the input value as empty field (`input || default`). Default is `false`.
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*
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* @return {Anything} The computed value.
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*/
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function Deffy(input, def, options) {
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// Default is a function
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if (typeof def === "function") {
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return def(input);
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}
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options = Typpy(options) === "boolean" ? {
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empty: options
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} : {
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empty: false
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};
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// Handle empty
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if (options.empty) {
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return input || def;
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}
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// Return input
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if (Typpy(input) === Typpy(def)) {
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return input;
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}
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// Return the default
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return def;
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}
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module.exports = Deffy;
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