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.

Javascript Examples

get user input javascript

ByAnurag batra July 29, 2022June 30, 2022

var name = prompt(“Please enter your name”, “Harry Potter”); Here is what the above code is Doing: 1. It’s creating a variable called name and assigning it the value of the prompt. 2. The prompt is asking the user to enter their name. 3. The prompt has a default value of “Harry Potter”.

Javascript Examples

check array values equal js

ByAnurag batra July 13, 2022June 30, 2022

[1,1,1,1].every( (val, i, arr) => val === arr[0] ) // true Here is what the above code is Doing: 1. The every() method tests whether all elements in the array pass the test implemented by the provided function. 2. The every() method executes the function once for each element present in the array: a. If…

Javascript Examples

onclick send to email javascript

ByAnurag batra September 21, 2022September 6, 2022

function sendMail() { var link = “mailto:me@example.com” + “?cc=myCCaddress@example.com” + “&subject=” + encodeURIComponent(“This is my subject”) + “&body=” + encodeURIComponent(document.getElementById(‘myText’).value) ; window.location.href = link; } Here is what the above code is Doing: 1. We create a link with the mailto: protocol. 2. We add the cc address to the link. 3. We add the…

Javascript Examples

cannot create directory no such file or directory

ByAnurag batra July 4, 2022June 30, 2022

mkdir -p /path-to-directory/directory-name Here is what the above code is Doing: 1. mkdir is the command to make a directory 2. -p is an option that tells mkdir to create the directory and any parent directories that don’t exist 3. /path-to-directory/directory-name is the path to the directory you want to create

Javascript Examples

return array javascript

ByAnurag batra July 9, 2022June 30, 2022

function func() { return [5, “string”, {a: 7}]; } Here is what the above code is Doing: 1. The function func() returns an array. 2. The array contains three elements: a. The first element is the number 5. b. The second element is the string “string”. c. The third element is an object with a…

Javascript Examples

microservices nodejs

ByAnurag batra July 11, 2022June 30, 2022

-> Microservices-based architecture lets you split your application into small units. -> Each part can independently deploy and scale; it does not matter if different programming languages and teams write it. -> You can also test the small units individually. Here is what the above code is Doing: 1. The first line of code is…

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