nodejs chaning env variable at runtime

ByAnurag batra July 16, 2022June 30, 2022

It isn't possible to modify the env vars 
of a running process. This isn't unique to 
NodeJS processes. It's just how env vars 
work on UNIX like operating systems.
The vars live within the address space of 
the process. And while they are, typically,
initially placed at a well known location
near the top of the stack the current vars are 
likely to be at an arbitrary address in the heap. 
Env vars are intentionally private to each process. 
So unless the program provides an API for 
changing its env vars you can't
modify them once the program is running.

Here is what the above code is Doing:
1. It’s creating a child process.
2. It’s setting the env vars of the child process.
3. It’s running the child process.
4. It’s waiting for the child process to exit.
5. It’s printing the exit code of the child process.

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javascript date minus seconds

ByAnurag batra July 27, 2022June 30, 2022

var d; d = new Date(‘2014-01-01 10:11:55’); alert(d.getMinutes() + ‘:’ + d.getSeconds()); //11:55 d.setSeconds(d.getSeconds() + 10); alert(d.getMinutes() + ‘:0’ + d.getSeconds()); //12:05 Here is what the above code is Doing: 1. Create a new Date object with the date and time set to January 1, 2014, 10:11:55. 2. Get the minutes and seconds of the…

Javascript Examples

onscroll add class jquery

ByAnurag batra July 3, 2022June 30, 2022

$(window).scroll(function() { var scroll = $(window).scrollTop(); if (scroll >= 500) { $(“.clearHeader”).addClass(“darkHeader”); } }); Here is what the above code is Doing: 1. When the page loads, the script checks to see if the window is scrolled more than 500 pixels. 2. If it is, it adds the class “darkHeader” to the element with the…

calling anonymous function while declaring it

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calling anonymous function while declaring it

ByAnurag batra September 28, 2022September 6, 2022

var step = (function(){ // this code is executed immediately, // the return value is assigned to `step` })(); Here is what the above code is Doing: 1. The function is defined and assigned to a variable. 2. The function is immediately executed. 3. The return value of the function is assigned to the variable.

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bot prefix discord.js

ByAnurag batra July 18, 2022June 30, 2022

const prefix = ‘!’ Here is what the above code is Doing: 1. We’re importing the discord.js library. 2. We’re creating a new Discord client. 3. We’re defining a command prefix.

Javascript Examples

string to jsonobject gson

ByAnurag batra July 9, 2022June 30, 2022

//use JsonParser; for example: JsonObject o = JsonParser.parseString(“{\”a\”: \”A\”}”).getAsJsonObject(); Here is what the above code is Doing: 1. Create a JsonParser object. 2. Parse the JSON string into a JsonElement object. 3. Get the JsonElement as a JsonObject. 4. Get the value of the “a” field as a String.

Javascript Examples

angular load on scroll

ByAnurag batra October 7, 2022September 6, 2022

@HostListener(“window:scroll”, []) onScroll(): void { if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) { // Load Your Data Here } } Here is what the above code is Doing: 1. We are using the @HostListener decorator to listen to the window’s scroll event. 2. We are checking if the user has scrolled to the bottom of the…

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