f1c9b08cf3
This includes certificates (where it does nothing), but does not include any translations.
93 lines
3.0 KiB
Markdown
93 lines
3.0 KiB
Markdown
---
|
|
id: cf1111c1c12feddfaeb3bdef
|
|
title: Use Conditional Logic with If Statements
|
|
challengeType: 1
|
|
isHidden: false
|
|
videoUrl: 'https://scrimba.com/c/cy87mf3'
|
|
forumTopicId: 18348
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
<code>If</code> statements are used to make decisions in code. The keyword <code>if</code> tells JavaScript to execute the code in the curly braces under certain conditions, defined in the parentheses. These conditions are known as <code>Boolean</code> conditions and they may only be <code>true</code> or <code>false</code>.
|
|
When the condition evaluates to <code>true</code>, the program executes the statement inside the curly braces. When the Boolean condition evaluates to <code>false</code>, the statement inside the curly braces will not execute.
|
|
<strong>Pseudocode</strong>
|
|
<blockquote>if (<i>condition is true</i>) {<br> <i>statement is executed</i><br>}</blockquote>
|
|
<strong>Example</strong>
|
|
|
|
```js
|
|
function test (myCondition) {
|
|
if (myCondition) {
|
|
return "It was true";
|
|
}
|
|
return "It was false";
|
|
}
|
|
test(true); // returns "It was true"
|
|
test(false); // returns "It was false"
|
|
```
|
|
|
|
When <code>test</code> is called with a value of <code>true</code>, the <code>if</code> statement evaluates <code>myCondition</code> to see if it is <code>true</code> or not. Since it is <code>true</code>, the function returns <code>"It was true"</code>. When we call <code>test</code> with a value of <code>false</code>, <code>myCondition</code> is <em>not</em> <code>true</code> and the statement in the curly braces is not executed and the function returns <code>"It was false"</code>.
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
Create an <code>if</code> statement inside the function to return <code>"Yes, that was true"</code> if the parameter <code>wasThatTrue</code> is <code>true</code> and return <code>"No, that was false"</code> otherwise.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: <code>trueOrFalse</code> should be a function
|
|
testString: assert(typeof trueOrFalse === "function");
|
|
- text: <code>trueOrFalse(true)</code> should return a string
|
|
testString: assert(typeof trueOrFalse(true) === "string");
|
|
- text: <code>trueOrFalse(false)</code> should return a string
|
|
testString: assert(typeof trueOrFalse(false) === "string");
|
|
- text: <code>trueOrFalse(true)</code> should return "Yes, that was true"
|
|
testString: assert(trueOrFalse(true) === "Yes, that was true");
|
|
- text: <code>trueOrFalse(false)</code> should return "No, that was false"
|
|
testString: assert(trueOrFalse(false) === "No, that was false");
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
function trueOrFalse(wasThatTrue) {
|
|
// Only change code below this line
|
|
|
|
|
|
|
|
// Only change code above this line
|
|
|
|
}
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
|
|
```js
|
|
function trueOrFalse(wasThatTrue) {
|
|
if (wasThatTrue) {
|
|
return "Yes, that was true";
|
|
}
|
|
return "No, that was false";
|
|
}
|
|
```
|
|
|
|
</section>
|