Tech Layoffs: How Engineers should be prepared for this chaotic situation.
Authored By: Sanjeet Tripathi
In the month of July 2022, Sundar Pichai the CEO of Google announced a hiring freeze in the company for the next few quarters. He also told his employees to work harder and be more efficient to survive this recession period. That was the first sign of the impact of the economic downfall on the tech Industry. Since then many big companies like Meta, Twitter, Netflix, and Amazon have announced layoffs in the last 3 months.
Although It was not new for India, by the start of this year many Indian startups had also laid off a lot of employees. This is a tough time for the laid-off Engineers as well as learning for the Engineers in other companies and students who are still in college. Let’s list out few things that Engineers and Students can do in this Layoff Season.
Why do we need Callback Function?
Callback functions are mostly used because of Asynchronous action in Javascript. Asynchronous Javascript led to the nonstop execution of code, it doesn’t stop the execution of a function until it got completed. Instead, keep executing it in the background and let the rest of the code run.
It’s not necessary that callback functions are only used with Asynchronous Javascript. It is used in both Synchronous and Asynchronous. Let’s see each in detail with examples.
Callback Function with Synchronous Javascript.
In Synchronous Javascript, callback functions are mostly used in all inbuilt functions. All array functions in Javascript use callback. Let us see the Array. map function in Javascript.
//Map Function in Javascript
let Arr = [24,27,98,87,54]
let mappedArray = Arr.map(ele => { return ele })
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Callback Function with Asynchronous Javascript.
In Asynchronous Javascript, Code execution does not stop to wait for a function to get completed, it runs that function in the background and executes the rest of the code. See below
//Asynchronous Javascript
//Function A
arr = [1,2,3,4,5,6,7.......,1000] //Array of length 1000
function printData(){
newArray = []
for(let i = 0; i < arr.length; i++){
ele = arr[i]*5
newArray.push(ele)
}
console.log(newArray)
}
//Funtion B
let finalResult = function (){
console.log("Data fetched from Array")
}
setInterval(printData,5000) //printData function will take 5 seconds to execute
finalResult()
Output:
Data fetched from Array
[5,10,15,20,25,30,35,40,……….,5000]
As we see above code, despite of written on the second, Function B is getting executed before Function A, due to setInterval() function. This is the basic feature of Asynchronous Javascript, but what if the result of Function B is dependent on Function A? In such case, we can use Function B as a callback for Function A so that it gets executed only after Function A. See below How to give the callback.
//Asynchronous Javascript
//Function A
arr = [1,2,3,4,5,6,7.......,1000] //Array of length 1000
function printData(callback){
newArray = []
for(let i = 0; i < arr.length; i++){
ele = arr[i]*5
newArray.push(ele)
}
console.log(newArray)
callback() //writing a callback function to execute at last
}
//Funtion B
let finalResult = function (){
console.log("Data fetched from Array")
}
setInterval(printData(finalResult),5000)
//finalResult function will be passed as the parameter and will act as callback
Output:
[5,10,15,20,25,30,35,40,……….,5000]
Data Fetched from Array
Now we can see that Function B is executed later despite the Asynchronous run of Function A. This is how the callback function works. It is mostly used when you are fetching data from Database.
Conclusion
We have seen What are the Callback Function, and how it works in Synchronous and Asynchronous Javascript. We have seen examples of it. The callback is one of the very important concepts. of Javascript which is exclusively used.
Keep Coding!!
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