Capturing a custom event in node js

Question

I know how promises and callbacks work in node js but I am very confused about how to capture custom events.
Let's say I have a global variable x

 var x = 10

Some asynchronus functions in the event loop update value of x. How can I capture variable x having a particular value? Like what should I do when I want to run a function

    foo()

when variable x attain a value of let's say 50?

Can you tell how the value of x is being modified either by synchronous function or asynchronous function? — nurulnabi
– nurulnabi, Commented Mar 18, 2017 at 12:39

André Dion · Accepted Answer · 2017-03-18 12:18:26Z

2

Use a function to set the variable:

var x = 10;

function setX(value) {
    x = value;

    if (x === 50) {
        foo();
    }
}

answered Mar 18, 2017 at 12:18

André Dion

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Comments

Muhammad Shaharyar · Accepted Answer · 2017-03-18 12:30:08Z

0

you can apply a check before calling a function like :

var num = 5;

function yourFunction(pass_value) {
    num  = num + pass_value; //your condition

   num == 50 && foo();    //it will only call when num = 50
}

answered Mar 18, 2017 at 12:30

Muhammad Shaharyar

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