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JavaScript: Count number of words in string

JavaScript validation with regular expression: Exercise-6 with Solution

Write a JavaScript program to count number of words in string.

The script will be used to:

- Remove white-space from start and end position.
- Convert 2 or more spaces to 1.
- Exclude newline with a start spacing.

Pictorial Presentation:

JavaScript: Count number of words in string

Sample Solution:-

HTML Code:

<!DOCTYPE html>
  <html>
  <head>
  <meta charset=utf-8 />
  <title>Count number of words in a string</title>
  <style type="text/css">
  body {margin-top: 40px;}
  </style> 
</head>
  <body>
  <textarea id="InputText" cols="30" rows="4">The quick brown fox jumps over the lazy dog.</textarea>
  <br>
  <input type="button" name="Convert" value="No. of Words" onClick="count_words();">
  <input id = "noofwords" type="text" value="" size="6"> 
  </body>
  </html>

JavaScript Code:

function count_words()
{
str1= document.getElementById("InputText").value;
//exclude  start and end white-space
str1 = str1.replace(/(^\s*)|(\s*$)/gi,"");
//convert 2 or more spaces to 1  
str1 = str1.replace(/[ ]{2,}/gi," ");
// exclude newline with a start spacing  
str1 = str1.replace(/\n /,"\n");
document.getElementById("noofwords").value = str1.split(' ').length;
}

Sample Output:

The quick brown fox jumps over the lazy dog.
  
9

Live Demo:

See the Pen javascript-regexp-exercise-6 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04