79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
77 lines
1.8 KiB
Markdown
77 lines
1.8 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244ac
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title: Increment a Number with JavaScript
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challengeType: 1
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---
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## Description
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<section id='description'>
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You can easily <dfn>increment</dfn> or add one to a variable with the <code>++</code> operator.
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<code>i++;</code>
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is the equivalent of
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<code>i = i + 1;</code>
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<strong>Note</strong><br>The entire line becomes <code>i++;</code>, eliminating the need for the equal sign.
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</section>
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## Instructions
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<section id='instructions'>
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Change the code to use the <code>++</code> operator on <code>myVar</code>.
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<strong>Hint</strong><br>Learn more about <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Increment_()" target="_blank">Arithmetic operators - Increment (++)</a>.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>myVar</code> should equal <code>88</code>
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testString: assert(myVar === 88, '<code>myVar</code> should equal <code>88</code>');
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- text: <code>myVar = myVar + 1;</code> should be changed
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testString: assert(/var\s*myVar\s*=\s*87;\s*\/*.*\s*([+]{2}\s*myVar|myVar\s*[+]{2});/.test(code), '<code>myVar = myVar + 1;</code> should be changed');
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- text: Use the <code>++</code> operator
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testString: assert(/[+]{2}\s*myVar|myVar\s*[+]{2}/.test(code), 'Use the <code>++</code> operator');
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- text: Do not change code above the line
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testString: assert(/var myVar = 87;/.test(code), 'Do not change code above the line');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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var myVar = 87;
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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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</div>
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### After Test
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<div id='js-teardown'>
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```js
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(function(z){return 'myVar = ' + z;})(myVar);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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var myVar = 87;
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myVar++;
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```
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</section>
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