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In C# whenever I wanted to print two digit numbers I've used
int digit=1;
Console.Write(digit.ToString("00"));
How can I do the same action in Javascript ?
Thanks
262
String formatting is also known as String interpolation. It is the process of inserting a custom string or variable in predefined text. As a data scientist, you would use it for inserting a title in a graph, show a message or an error, or pass a statement to a function.
In JavaScript, there are three ways to write a string — they can be written inside single quotes ( ' ' ), double quotes ( " " ), or backticks ( ` ` ). The type of quote used must match on both sides, however it is possible that all three styles can be used throughout the same script.
Note: we can easily use single quotes ( ' ) and double quotes ( " ) inside the backticks ( ` ). Example: var nameStr = `I'm "Alpha" Beta`; To interpolate the variables or expression we can use the ${expression} notation for that.
c# digit.toString("00") appends one zero to the left of digit (left padding). In javascript I use this functon for that:
function zeroPad(nr,base){
var len = (String(base).length - String(nr).length)+1;
return len > 0? new Array(len).join('0')+nr : nr;
}
zeroPad(1,10); //=> 01
zeroPad(1,100); //=> 001
zeroPad(1,1000); //=> 0001
You can also rewrite it as an extention to Number:
Number.prototype.zeroPad = Number.prototype.zeroPad ||
function(base){
var nr = this, len = (String(base).length - String(nr).length)+1;
return len > 0? new Array(len).join('0')+nr : nr;
};
//usage:
(1).zeroPad(10); //=> 01
(1).zeroPad(100); //=> 001
(1).zeroPad(1000); //=> 0001
[edit oct. 2021]
A static es20xx Number method, also suitable for negative numbers.
Number.padLeft = (nr, len = 2, padChr = `0`) =>
`${nr < 0 ? `-` : ``}${`${Math.abs(nr)}`.padStart(len, padChr)}`;
console.log(Number.padLeft(3));
console.log(Number.padLeft(284, 5));
console.log(Number.padLeft(-32, 12));
console.log(Number.padLeft(-0)); // Note: -0 is not < 0If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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