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86 lines
1.8 KiB
86 lines
1.8 KiB
/**
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* An object that can be used as an array with a key
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* Like PHP's array
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* @template K
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* @template V
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*/
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class ArrayWithKey {
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/**
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* All keys that are stored in the current object
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* @type {K[]}
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* @private
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*/
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__stack = [];
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/**
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* Push an element to the end of the array
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* @param {K} key The key of the element
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* @param {V} value The value of the element
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* @returns {void}
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*/
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push(key, value) {
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this[key] = value;
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this.__stack.push(key);
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}
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/**
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* Get the last element and remove it from the array
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* @returns {V|undefined} The first value, or undefined if there is no element to pop
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*/
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pop() {
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let key = this.__stack.pop();
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let prop = this[key];
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delete this[key];
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return prop;
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}
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/**
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* Get the last key
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* @returns {K|null} The last key, or null if the array is empty
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*/
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getLastKey() {
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if (this.__stack.length === 0) {
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return null;
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}
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return this.__stack[this.__stack.length - 1];
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}
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/**
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* Get the first element
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* @returns {{key:K,value:V}|null} The first element, or null if the array is empty
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*/
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shift() {
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let key = this.__stack.shift();
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let value = this[key];
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delete this[key];
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return {
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key,
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value,
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};
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}
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/**
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* Get the length of the array
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* @returns {number} Amount of elements stored
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*/
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length() {
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return this.__stack.length;
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}
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/**
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* Get the last value
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* @returns {V|null} The last element without removing it, or null if the array is empty
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*/
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last() {
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let key = this.getLastKey();
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if (key === null) {
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return null;
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}
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return this[key];
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}
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}
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module.exports = {
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ArrayWithKey
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};
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