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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:

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

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <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>
</head>
<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:

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

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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Next: Write a JavaScript program to count the number of vowels of a given string.

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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