Question

Second console.log() executed by WSFunctions[this.name](); will print undentified. I was wondering if I am able somehow to inherit DoThisAndThat in my Call() function. I didn’t want to pass params in the way WSFunctions[this.name](this.params) as while project grows there may be more than this.params to pass.

function WS(name, params) {
    this.name = name;
    this.params = params;
}

WS.prototype.Call = function() {
    if (typeof WSFunctions[this.name] !== "function") {
        return false;
    }

    console.log(this.params);
    WSFunctions[this.name]();

    return true;
}

var WSFunctions = {
    'ScreenRightGuest': function() {
        // .. whatever ..
        return true;        
    },
    'DoThisAndThat': function() {
        console.log(this.params);
        return true;
    }
}


new WS('DoThisAndThat', { login: '123', pass: 'abc' }).Call();

Thanks in advance
Mike

Answer 1

You can explicitly set what this should refer to in a function using .call ^[MDN] or .apply ^[MDN]

WSFunctions[this.name].call(this);

This will call WSFunctions[this.name] with this being set to what this refers to in the caller (in this case the instance created by new WS(...)).

Also have a look at this page which thoroughly explains how this works.