# JavaScript: Check whether the characters a and b are separated by exactly 3 places anywhere in a given string

## JavaScript Basic: Exercise-53 with Solution

Write a JavaScript program to check whether the characters a and b are separated by exactly 3 places anywhere (at least once) in a given string.

Pictorial Presentation:

Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JavaScript program to check whether the characters a and b are separated by exactly 3 places anywhere (at least once) in a given string.</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function ab_Check(str)
{
return (/a...b/).test(str) || (/b...a/).test(str);
}

console.log(ab_Check("Chainsbreak"));
console.log(ab_Check("pane borrowed"));
console.log(ab_Check("abCheck"));
```
```

Sample Output:

```true
true
false
```

Flowchart:

ES6 Version:

``````function ab_Check(str)
{
return (/a...b/).test(str) || (/b...a/).test(str);
}

console.log(ab_Check("Chainsbreak"));
console.log(ab_Check("pane borrowed"));
console.log(ab_Check("abCheck"));
``````

Live Demo:

See the Pen JavaScript - Check whether the characters a and b are separated by exactly 3 places - basic-ex-53 by w3resource (@w3resource) on CodePen.

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## JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

```const sumPower = (end, power = 2, start = 1) =>
Array(end + 1 - start)
.fill(0)
.map((x, i) => (i + start) ** power)
.reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925
```

Output:

```385
3025
2925
```