How to use the prototype functions in predefined global variables in Javascript?

Question

Please tell me how can I use the injected functions in predefined variables. Here's the script to convert a string into camel case, but I don't know how to use it.

String.prototype.toCamelCase = function(str) {
    return str
        .replace(/\s(.)/g, function($1) { return $1.toUpperCase(); })
        .replace(/\s/g, '')
        .replace(/^(.)/, function($1) { return $1.toLowerCase(); });
}

Also, tell me if there is any relevancy of using $1 as the arguments! I mean is there any use of $ in this function?

P.S. I took this script from this question.

score 0 · Accepted Answer · answered Mar 27 '18 at 15:09

Also, tell me if there is any relevancy of using $1 as the arguments! I mean is there any use of $ in this function?

No, it's just the param's name.

Please tell me how can I use the injected functions in predefined variables. Here's the script to convert a string into camel case, but I don't know how to use it.

You only need to instantiate variables of that type (string).
The prototype is useful when you need to operate over the specific object, so you don't need to pass a string, rather, use the current context this, in this case, a string.

String.prototype.toCamelCase = function() {
    return this // Here you use the current object using the context 'this'
        .replace(/\s(.)/g, function($1) { return $1.toUpperCase(); })
        .replace(/\s/g, '')
        .replace(/^(.)/, function($1) { return $1.toLowerCase(); });
}

console.log("ele from so".toCamelCase());

How to use the prototype functions in predefined global variables in Javascript?

1 Answers1