83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
|
---
|
|||
|
|
id: 8d1923c8c441eddfaeb5bdef
|
|||
|
|
title: Size of the Set
|
|||
|
|
challengeType: 1
|
|||
|
|
videoUrl: ''
|
|||
|
|
localeTitle: Размер набора
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
## Description
|
|||
|
|
<section id="description"> В этом упражнении мы собираемся создать функцию размера для нашего Set. Эта функция должна быть названа <code>this.size</code> и она должна вернуть размер коллекции. </section>
|
|||
|
|
|
|||
|
|
## Instructions
|
|||
|
|
<section id="instructions">
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Tests
|
|||
|
|
<section id='tests'>
|
|||
|
|
|
|||
|
|
```yml
|
|||
|
|
tests:
|
|||
|
|
- text: Класс <code>Set</code> должен иметь метод <code>size</code> .
|
|||
|
|
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: Метод <code>size</code> должен возвращать количество элементов в коллекции.
|
|||
|
|
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.");'
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Challenge Seed
|
|||
|
|
<section id='challengeSeed'>
|
|||
|
|
|
|||
|
|
<div id='js-seed'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
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
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Solution
|
|||
|
|
<section id='solution'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
// solution required
|
|||
|
|
```
|
|||
|
|
</section>
|