ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
87 lines
1.7 KiB
Markdown
87 lines
1.7 KiB
Markdown
---
|
|
id: 587d8254367417b2b2512c70
|
|
title: Create and Add to Sets in ES6
|
|
challengeType: 1
|
|
forumTopicId: 301636
|
|
dashedName: create-and-add-to-sets-in-es6
|
|
---
|
|
|
|
# --description--
|
|
|
|
Now that you have worked through ES5, you are going to perform something similar in ES6. This will be considerably easier. ES6 contains a built-in data structure `Set` so many of the operations you wrote by hand are now included for you. Let's take a look:
|
|
|
|
To create a new empty set:
|
|
|
|
`var set = new Set();`
|
|
|
|
You can create a set with a value:
|
|
|
|
`var set = new Set(1);`
|
|
|
|
You can create a set with an array:
|
|
|
|
`var set = new Set([1, 2, 3]);`
|
|
|
|
Once you have created a set, you can add the values you wish using the `add` method:
|
|
|
|
```js
|
|
var set = new Set([1, 2, 3]);
|
|
set.add([4, 5, 6]);
|
|
```
|
|
|
|
As a reminder, a set is a data structure that cannot contain duplicate values:
|
|
|
|
```js
|
|
var set = new Set([1, 2, 3, 1, 2, 3]);
|
|
// set contains [1, 2, 3] only
|
|
```
|
|
|
|
# --instructions--
|
|
|
|
For this exercise, return a set with the following values: `1, 2, 3, 'Taco', 'Cat', 'Awesome'`
|
|
|
|
# --hints--
|
|
|
|
Your `Set` should only contain the values `1, 2, 3, Taco, Cat, Awesome`.
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
var test = checkSet();
|
|
return (
|
|
test.size == 6 &&
|
|
test.has(1) &&
|
|
test.has(2) &&
|
|
test.has(3) &&
|
|
test.has('Taco') &&
|
|
test.has('Cat') &&
|
|
test.has('Awesome')
|
|
);
|
|
})()
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function checkSet() {
|
|
var set = new Set([1, 2, 3, 3, 2, 1, 2, 3, 1]);
|
|
// Only change code below this line
|
|
|
|
// Only change code above this line
|
|
console.log(Array.from(set));
|
|
return set;
|
|
}
|
|
|
|
checkSet();
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
function checkSet(){var set = new Set([1,2,3,'Taco','Cat','Awesome']);
|
|
return set;}
|
|
```
|