根据作为属性值给出的对象执行功能

Question

I have an object containing property values as function names. This is my object obj :

var obj = {
    beforeCalc: beforeCalc,
    calcEcn: calcEcn
};

function beforeCalc() {
    console.log("beforeCalcMethodExecuted");
}

function calcEcn() {
    console.log("calcEcnMethodExecuted");
}

Running the objects property values like this.

function runMethodsFromObj() {
    for (var i in obj) {
    console.log(i); // beforeCalc, calcEcn
    console.log(i()); //i is not defined 
  }
}
runMethodsFromObj();

Why is it returning undefined ?

Answer 1

The for-in loop gives you the keys of the object and not their value

 var obj = { beforeCalc: beforeCalc, calcEcn: calcEcn }; function beforeCalc() { console.log("beforeCalcMethodExecuted"); } function calcEcn() { console.log("calcEcnMethodExecuted"); } function runMethodsFromObj() { for (var i in obj) { console.log(i); // beforeCalc, calcEcn console.log(typeof i); // string obj[i](); // Executes the stored function } } runMethodsFromObj();