Complete examples of Map collection tools implemented by Javascript _ javascript skills

This article mainly introduces the Map set tool class implemented by Javascript, and analyzes the construction, search, deletion, and judgment of map sets implemented by javascript in the form of a complete example, you can refer to the examples in this article to illustrate the Map set tool class implemented by Javascript. Share it with you for your reference. The details are as follows:

Var Map = function () {// construct the entry object var Entry = function (key, value) {this. key = key; this. value = value;} this. entries = new Array (); // construct the put method and put an Entry this in the Array. put = function (key, value) {// If an array already exists, the for (var I = 0; I <this. size (); I ++) {if (this. entries [I]. key === key) {return false ;}} this. entries. push (new Entry (key, value) ;}; // simulate the get method this. get = function (key) {for (var I = 0; I <This. size (); I ++) {if (this. entries [I]. key = key) {return this. entries [I]. value ;}} return null ;}; // you can call this operation to find the tag value. indexOf = function (key) {var index =-1; for (var I = 0; I <this. size (); I ++) {if (this. entries [I]. key = key) {index = I; break;} return index;} // delete an element this. remove = function (key) {var index = this. indexOf (key); if (index! =-1) {this. entries. splice (index, 1) ;}// obtain the map length this. size = function () {return this. entries. length ;}; // reset the key-value pair this. setValue = function (key, value) {var index = this. indexOf (key); if (index! =-1) {this. entries [I]. value = value ;};}; // whether it is empty map this. isEmpty = function () {return this. size () <= 0 ;}; // clear map; this. clear = function () {this. entries = [] ;}; // obtain the entry object this. getEntry = function (index) {if (index> = 0 & index <this. size () {return this. entries [index];} return null;} this. toString = function () {var str = "["; for (var I = 0; I <this. size (); I ++) {str + = this. getEntry (I ). key + "=" + this. getEntry (I ). value + ",";} // remove the last "," str = str. substring (0, str. length-1); str + = "]"; return str ;};}

I hope this article will help you design javascript programs.