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>
78 lines
1.1 KiB
Markdown
78 lines
1.1 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244ad
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title: 数字递减
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/cM2KeS2'
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forumTopicId: 17558
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dashedName: decrement-a-number-with-javascript
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---
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# --description--
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使用自减符号`--`，你可以很方便地对一个变量执行<dfn>自减</dfn>或者`-1`运算。
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`i--;`
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等效于
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`i = i - 1;`
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**提示**
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`i--;`这种写法，省去了书写`=`符号的必要。
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# --instructions--
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重写代码，使用`--`符号对`myVar`执行自减操作。
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# --hints--
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`myVar`应该等于`10`。
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```js
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assert(myVar === 10);
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```
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`myVar = myVar - 1;`语句应该被修改。
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```js
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assert(
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/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code)
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);
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```
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对`myVar`使用`--`运算符。
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```js
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assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code));
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```
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不要修改注释上面的代码。
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```js
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assert(/var myVar = 11;/.test(code));
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```
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# --seed--
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## --after-user-code--
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```js
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(function(z){return 'myVar = ' + z;})(myVar);
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```
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## --seed-contents--
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```js
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var myVar = 11;
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// Only change code below this line
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myVar = myVar - 1;
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```
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# --solutions--
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```js
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var myVar = 11;
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myVar--;
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```
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