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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

Parameter's value

function getItems(fruitList, ...args, favoriteFruit) {
  return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

function getItems(fruitList, favoriteFruit, ...args) {
  return [...fruitList, ...args, favoriteFruit];
}


getItems(['banana', 'apple'], 'pear', 'orange');
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

Ref: https://bit.ly/3jFRBje