3.0 KiB
3.0 KiB
id | title | challengeType | videoUrl | localeTitle |
---|---|---|---|---|
8d1323c8c441eddfaeb5bdef | Create a Set Class | 1 | 创建一个Set类 |
Description
var set = new Object();在接下来的几个练习中,我们将从头开始构建一个全功能的Set。对于本练习,只要该值中尚不存在该值,就创建一个将值添加到set集合的函数。例如:
set.foo = true;
//看看我们的集合中是否存在foo:
console.log(set.foo)// true
this.add = function(element){如果成功添加该值,则该函数应返回
//一些代码来为集合添加值
}
true
否则返回false
。 Instructions
Tests
tests:
- text: 您的<code>Set</code>类应该有一个<code>add</code>方法。
testString: 'assert((function(){var test = new Set(); return (typeof test.add === "function")}()), "Your <code>Set</code> class should have an <code>add</code> method.");'
- text: 您的<code>add</code>方法不应添加重复值。
testString: 'assert((function(){var test = new Set(); test.add("a"); test.add("b"); test.add("a"); var vals = test.values(); return (vals[0] === "a" && vals[1] === "b" && vals.length === 2)}()), "Your <code>add</code> method should not add duplicate values.");'
- text: 成功添加值后, <code>add</code>方法应返回<code>true</code> 。
testString: 'assert((function(){var test = new Set(); var result = test.add("a"); return (result != undefined) && (result === true);}()), "Your <code>add</code> method should return <code>true</code> when a value has been successfully added.");'
- text: <code>add</code>重复值时, <code>add</code>方法应返回<code>false</code> 。
testString: 'assert((function(){var test = new Set(); test.add("a"); var result = test.add("a"); return (result != undefined) && (result === false);}()), "Your <code>add</code> method should return <code>false</code> when a duplicate value is added.");'
Challenge Seed
function Set() {
// the var collection will hold our 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;
};
// change code below this line
// change code above this line
}
Solution
// solution required