In a recent interview, I was asked, do you know the concept of idempotency in APIs.
I had read it once but I couldn't recall it, felt dumb a bit, so I went back and I read all I can about it.

So here's an example, if the API's were not idempotent would have happened,

Let's say I want to buy a flight ticket from Ahmedabad to Delhi for 3000 INR. I am paying via my Paytm wallet having 10K balance.
I pressed the pay button but nothing happened so after a few seconds I again tried it and it was successful.

After a minute, I got 2 notifications saying we have booked your flight from Ahmedabad to Delhi and your current balance is 4000 INR, and with that follows a mild heart attack, and a loss of 3000 INR, and what if I was booking a flight from Ahmedabad to USA, 😵🪦dead...(account balance).

But in real life, APIs are idempotent.
Meaning, when you press pay once, it stores your request, when you again retry it, it goes and checks, is it the same request??? If yes, it doesn't process it again and voilaa the payment is only done once.

#interview #api #idempotent #learningandgrowing

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Anonymous functions

Correct code but no results because this is a bug in anonymous functions

Because this keyword does not means instance var it's behaving like a local instance

To overcome context issues (this ) keyword issue we have arrow function

Parentheses, curly braces , and return keyword is optional in arrow function

DE-STRUCTURING In React-Js

Merge array with React-Js

67% wrong answer

59% wrong answer

31% wrong answer