d3304276ca
* Make tests stricter for challenge "Decrement a number with javascript" #44648 * Update decrement-a-number-with-javascript.md
85 lines
1.2 KiB
Markdown
85 lines
1.2 KiB
Markdown
---
|
|
id: 56533eb9ac21ba0edf2244ad
|
|
title: Decrement a Number with JavaScript
|
|
challengeType: 1
|
|
videoUrl: 'https://scrimba.com/c/cM2KeS2'
|
|
forumTopicId: 17558
|
|
dashedName: decrement-a-number-with-javascript
|
|
---
|
|
|
|
# --description--
|
|
|
|
You can easily <dfn>decrement</dfn> or decrease a variable by one with the `--` operator.
|
|
|
|
```js
|
|
i--;
|
|
```
|
|
|
|
is the equivalent of
|
|
|
|
```js
|
|
i = i - 1;
|
|
```
|
|
|
|
**Note:** The entire line becomes `i--;`, eliminating the need for the equal sign.
|
|
|
|
# --instructions--
|
|
|
|
Change the code to use the `--` operator on `myVar`.
|
|
|
|
# --hints--
|
|
|
|
`myVar` should equal `10`.
|
|
|
|
```js
|
|
assert(myVar === 10);
|
|
```
|
|
|
|
`myVar = myVar - 1;` should be changed.
|
|
|
|
```js
|
|
assert(!code.match(/myVar\s*=\s*myVar\s*[-]\s*1.*?;?/));
|
|
```
|
|
|
|
You should not assign `myVar` with `10`.
|
|
|
|
```js
|
|
assert(!code.match(/myVar\s*=\s*10.*?;?/));
|
|
```
|
|
|
|
You should use the `--` operator on `myVar`.
|
|
|
|
```js
|
|
assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code));
|
|
```
|
|
|
|
You should not change code above the specified comment.
|
|
|
|
```js
|
|
assert(/let myVar = 11;/.test(code));
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --after-user-code--
|
|
|
|
```js
|
|
(function(z){return 'myVar = ' + z;})(myVar);
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
let myVar = 11;
|
|
|
|
// Only change code below this line
|
|
myVar = myVar - 1;
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
let myVar = 11;
|
|
myVar--;
|
|
```
|