Trim string in JavaScript?

Question

How do I trim a string in JavaScript? That is, how do I remove all whitespace from the beginning and the end of the string in JavaScript?

Answer 1

Here it is in TypeScript:

var trim: (input: string) => string = String.prototype.trim
    ? ((input: string) : string => {
        return (input || "").trim();
    })
    : ((input: string) : string => {
        return (input || "").replace(/^\s+|\s+$/g,"");
    })

It will fall back to the regex if the native prototype is not available.