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45 lines
930 B
45 lines
930 B
/**
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* @author Titus Wormer
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* @copyright 2016 Titus Wormer
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* @license MIT
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* @module state-toggle
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* @fileoverview Enter/exit a state.
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*/
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'use strict';
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/* eslint-env commonjs */
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/* Expose. */
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module.exports = factory;
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/**
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* Construct a state `toggler`: a function which inverses
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* `property` in context based on its current value.
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* The by `toggler` returned function restores that value.
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*
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* @param {string} key - Property to toggle.
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* @param {boolean} state - Default state.
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* @param {Object?} [ctx] - Context object.
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* @return {Function} - Enter.
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*/
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function factory(key, state, ctx) {
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/**
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* Enter a state.
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*
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* @return {Function} - Exit state.
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*/
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return function () {
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var context = ctx || this;
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var current = context[key];
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context[key] = !state;
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/**
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* Cancel state to its value before entering.
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*/
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return function () {
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context[key] = current;
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};
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};
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}
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