JavaScript: Pad (left, right) a string to get to a determined length
JavaScript String: Exercise-20 with Solution
Write a JavaScript function that can pad (left, right) a string to get to a determined length.
Test Data:
console.log(formatted_string('0000',123,'l'));
console.log(formatted_string('00000000',123,''));
Output:
"0123"
"12300000"
Pictorial Presentation:

Sample Solution:-
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Write a JavaScript function that can pad (left, right) a string to get to a determined length.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function formatted_string(pad, user_str, pad_pos)
{
if (typeof user_str === 'undefined')
return pad;
if (pad_pos == 'l')
{
return (pad + user_str).slice(-pad.length);
}
else
{
return (user_str + pad).substring(0, pad.length);
}
}
console.log(formatted_string('0000',123,'l'));
console.log(formatted_string('00000000',123,''));
Sample Output:
0123 12300000
Flowchart:

Live Demo:
See the Pen JavaScript Pad (left, right) a string to get to a determined length - string-ex-20 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Tagged template literals
function getPersonInfo(one, two, three) { console.log(one); console.log(two); console.log(three); } const person = 'Lydia'; const age = 21; getPersonInfo`${person} is ${age} years old`;
If you use tagged template literals, the value of the first argument is always an array of the string values. The remaining arguments get the values of the passed expressions!
Ref: https://bit.ly/323Y0P6
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