CODEWITHSUNDEEP
javascriptnode.js
user7235699
user7235699

Reputation: 431

Capturing a custom event in node js

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?

Upvotes: 0

Views: 60

Answers (2)

Muhammad Shaharyar
Muhammad Shaharyar

Reputation: 1104

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
}

Upvotes: 0

André Dion
André Dion

Reputation: 21708

Use a function to set the variable:

var x = 10;

function setX(value) {
    x = value;

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

Upvotes: 2

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