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JavaScript: Create a Zerofilled value with optional +, - sign

JavaScript String: Exercise-36 with Solution

Write a JavaScript function to create a Zerofilled value with optional +, - sign.

Test Data:
console.log(zeroFill(120, 5, '-'));
"+00120"
console.log(zeroFill(29, 4));
"0029"

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to create a Zerofilled value with optional +, - sign.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function zeroFill(number, width, osign) {
    var num = '' + Math.abs(number),
        zerosw = width - num.length,
        sign = number >= 0;
    return (sign ? (osign ? '+' : '') : '-') +
        Math.pow(10, Math.max(0, zerosw)).toString().substr(1) + num;
}

console.log(zeroFill(120, 5, '-'));

console.log(zeroFill(29, 4));

Sample Output:

+00120
0029

Flowchart:

Flowchart: JavaScript- Create a Zerofilled value with optional +, - sign

Live Demo:

See the Pen JavaScript Create a Zerofilled value with optional +, - sign-string-ex-36 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: 

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

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