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JavaScript: Count the number of vowels in a given string

JavaScript Basic: Exercise-54 with Solution

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

Pictorial Presentation:

JavaScript: Count the number of vowels of 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 count the number of vowels in a given string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function vowel_Count(str)
{ 

  return str.replace(/[^aeiou]/g, "").length; 
}

console.log(vowel_Count("Python"));
console.log(vowel_Count("w3resource.com"));

Sample Output:

1
5

Flowchart:

Flowchart: JavaScript - Count the number of vowels in a given string

ES6 Version:

function vowel_Count(str)
{ 

  return str.replace(/[^aeiou]/g, "").length; 
}

console.log(vowel_Count("Python"));
console.log(vowel_Count("w3resource.com"));

Live Demo:

See the Pen JavaScript - count the number of vowels in a given string - basic-ex-54 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to check if the characters a and b are separated by exactly 3 places anywhere (at least once) in a given string.
Next: Write a JavaScript program to check if a given string contains equal number of p's and t's present.

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JavaScript: Tips of the Day

Assigns default values for all properties in an object that are undefined

Example:

const tips_defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
console.log(tips_defaults({ p: 1 }, { q: 2 }, { q: 6 }, { p: 3 }));

Output:

[object Object] {
  p: 1,
  q: 2
}

 

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