JavaScript: Print an integer with commas as thousands separators
JavaScript validation with regular expression: Exercise-21 with Solution
Write a JavaScript function to print an integer with thousands separated by commas.
Pictorial Presentation:

Sample Solution:-
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to print an integer with commas as thousands separators</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function thousands_separators(num)
{
var num_parts = num.toString().split(".");
num_parts[0] = num_parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
return num_parts.join(".");
}
console.log(thousands_separators(1000));
console.log(thousands_separators(10000.23));
console.log(thousands_separators(100000));
Sample Output:
1,000 10,000.23 100,000
Flowchart:

Live Demo:
See the Pen javascript-regexp-exercise-21 by w3resource (@w3resource) on CodePen.
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