how using parameter value to call function?

Question

Is there any way to use passed parameter to call function in javascript.

eg:

var Animal = (function(){
    function Animal(type){
        this.type(); eg this.snake(); if the parameter type is "snake"
    }
    return Animal;
})();

var animal = new Animal("snake");

Thanks!

Sarath · Accepted Answer · 2013-07-20 08:43:09Z

2

Javascript object properties act like associative arrays so this.a == this['a']

   var Animal = (function(){
        function Animal(type){
            this[type](); //eg this.snake(); if the parameter type is "snake"
        }
        return Animal;
    })();

edited Jul 20, 2013 at 8:43

answered Jul 20, 2013 at 8:36

Sarath

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4 Comments

Starx Over a year ago

They do not act like arrays.

Niccolò Campolungo Over a year ago

@Starx is right, functions are not arrays, they're objects! And objects have dot notation and bracket notation.

Sarath Over a year ago

i said they act like associative arrays , obviously objects are not arrays,, act like

Starx Over a year ago

Associative array are also arrays.

Starx · Accepted Answer · 2013-07-20 08:36:39Z

1

You can reference it like an array. In your case it would be this[type]

function Animal(type){
    this[type]();
}

Additionally, if you do not know the object or if the variable is global, then you can use window like in the same context. For example

var apple = 'tasty';
var fruit = 'apple';
console.log(window[fruit]); // Will give `tasty` as output

answered Jul 20, 2013 at 8:36

Starx

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