| 1 | 'use strict';
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| 2 |
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| 3 | const flattenArray = (array = [], result = []) => {
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| 4 | for (let i = 0; i < array.length; i++) {
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| 5 | const value = array[i];
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| 6 |
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| 7 | if (Array.isArray(value))
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| 8 | flattenArray(value, result);
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| 9 | else
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| 10 | result.push(value);
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| 11 | }
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| 12 |
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| 13 | return result;
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| 14 | };
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| 15 |
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| 16 | const flatten = (array = []) => {
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| 17 | if (!Array.isArray(array))
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| 18 | array = [array];
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| 19 | return flattenArray(array);
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| 20 | };
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| 21 |
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| 22 | class Lazy {
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| 23 | constructor(factory) {
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| 24 | this.factory = factory;
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| 25 | this.instance = null;
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| 26 | }
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| 27 |
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| 28 | get created() {
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| 29 | return !!this.instance;
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| 30 | }
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| 31 |
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| 32 | ifCreated(fn = () => {}) {
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| 33 | if (this.instance)
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| 34 | return fn(this.instance);
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| 35 | return null;
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| 36 | }
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| 37 |
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| 38 | get() {
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| 39 | if (!this.instance)
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| 40 | this.instance = this.factory();
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| 41 | return this.instance;
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| 42 | }
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| 43 | }
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| 44 |
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| 45 | module.exports = {
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| 46 | Lazy,
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| 47 | flatten,
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| 48 | };
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