freeCodeCamp/curriculum/challenges/chinese/08-coding-interview-prep/data-structures/size-of-the-set.chinese.md

id	title	challengeType	videoUrl	localeTitle
8d1923c8c441eddfaeb5bdef	Size of the Set	1		套装的大小

Description

在本练习中，我们将为Set创建一个size函数。此函数应命名为this.size ，它应返回集合的大小。

Instructions

Tests

tests:
  - text: 您的<code>Set</code>类应该有一个<code>size</code>方法。
    testString: 'assert((function(){var test = new Set(); return (typeof test.size === "function")}()), "Your <code>Set</code> class should have a <code>size</code> method.");'
  - text: <code>size</code>方法应返回集合中的元素数。
    testString: 'assert((function(){var test = new Set(); test.add("a");test.add("b");test.remove("a");return (test.size() === 1)}()), "The <code>size</code> method should return the number of elements in the collection.");'

Challenge Seed

function Set() {
    // the var collection will hold the set
    var collection = [];
    // this method will check for the presence of an element and return true or false
    this.has = function(element) {
        return (collection.indexOf(element) !== -1);
    };
    // this method will return all the values in the set
    this.values = function() {
        return collection;
    };
    // this method will add an element to the set
    this.add = function(element) {
        if(!this.has(element)){
            collection.push(element);
            return true;
        }
        return false;
    };
    // this method will remove an element from a set
    this.remove = function(element) {
        if(this.has(element)){
           var index = collection.indexOf(element);
            collection.splice(index,1);
            return true;
        }
        return false;
    };
    // change code below this line
    // change code above this line
}

Solution

// solution required