JavaScript: Find out which day was in yesterday

JavaScript Datetime: Exercise-10 with Solution

Write a JavaScript function to calculate 'yesterday day'.

Test Data:
console.log(yesterday('Nov 15, 2014'));
console.log(yesterday('Nov 16, 2015'));
console.log(yesterday('Nov 17, 2016'));
Output :
"Fri Nov 14 2014 00:00:00 GMT+0530 (India Standard Time)"
"Sun Nov 15 2015 00:00:00 GMT+0530 (India Standard Time)"
"Wed Nov 16 2016 00:00:00 GMT+0530 (India Standard Time)"

Sample Solution:-

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Find out which day was in yesterday</title>
<body>
</body>
</html>
```
```

JavaScript Code:

``````var yesterday =  function(date1){
var dt = new Date(date1);
return new Date((dt.setDate(dt.getDate()-1))).toString();
}
console.log(yesterday('Nov 15, 2014'));
console.log(yesterday('Nov 16, 2015'));
console.log(yesterday('Nov 17, 2016'));
```
```

Sample Output:

```Fri Nov 14 2014 00:00:00 GMT+0530 (India Standard Time)
Sun Nov 15 2015 00:00:00 GMT+0530 (India Standard Time)
Wed Nov 16 2016 00:00:00 GMT+0530 (India Standard Time)
```

Flowchart:

Live Demo:

See the Pen JavaScript - Find out which day was in yesterday-date-ex- 10 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

Convert tabs to spaces, where each tab corresponds to count spaces

Example:

```const tips_expandTabs = (str, count) => str.replace(/\t/g, ' '.repeat(count));
console.log(tips_expandTabs('\t\tw3resource', 4));
```

Output:

```"        w3resource"
```