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Sorry, but your solution is not 100% correct. The return type is wrong. If someone calls let arr = ["Hello", "World", "lets go"] print(map(arr) { $0.count }) your solution will throw an error. The correct solution would be: func map<T, U>(_ elements: [T], _ transform: (T) -> U) -> [U] { var results = [U]() for element in elements { results.append(transform(element)) } return results }

The output part you talked about at the end is wrong. In Swift, we always have an unordered dictionary which is output1 in your case. Try running your program more than once and you can see the change in the output. The output preserved in the same order in your video is just a coincidence.

The possible solutions can be 1. Using serial queues - Use a serial queue inside the concurrentPerform 2. Using NSLock - something like this lock.lock() print (array) let last = (array.last ?? 0) + 1 array.append(last) lock.unlock()

good explanation

Great m, well crafted 🎉

By the way map not always return same as input type. Transform can decide output type. so type U also may required.

I was asked a question similar to this for Blinkit's interview

Awesome content so far in this playlist, very crisp and clear to the point, without any beating around the bush. I like it. Thanks a lot Brother. 🏹➡🎯.

Good ❤

let output1 = Dictionary(uniqueKeysWithValues: selectedItems.compactMap { key in menuItems[key].map { (key, $0) }})

Hii, I seen your video what I did not understand How data structure managed in this. Please explain more.

Thanks for sharing such interview questions. Please continue to share such videos, we are getting educate from you.

Your videos are very informative. I am learning a lot from all these. I will request you to please share more videos like these, where we learn on market standards and current internet trends and how we ca prepare for such topics. Please help sharing such information. people like us, who don't have much exposure, only these kind of videos educate us. THANKS

1 query : as we initialised 'anotherObject' in line 8 then at least in line 9 it should need to print the default value of name as 'Name '. i previously was thinking, the print will come as Name, but once the compiler goes out of scope of someFunc() then anotherObject becomes nil. Please help make me understand this concept, Many Thanks for this video. What's your name ?

this is classic race condition, you can't be sure that 9 is printed after 1, maybe global queue starts implementing first async block right away and prints 2 after 1

Why did 8 come second last? Is 8 in the same thread(global) as 2 & 4. Can you please clarify?

Promo'SM

And what is the solution? Using serial queues? Or Actors?

The problem statement can be described like this: Functional Requirements: Generic Type: The MyOptional type should be generic, capable of holding any type of value. Initialization: It should be possible to initialize MyOptional with a value or as nil. Unwrapping: Implement a method to safely unwrap the value, returning a default value if the optional is none. Optional Chaining (Bonus): As a bonus challenge, implement a simplified form of optional chaining that allows methods and properties to be accessed on the optional's value directly from the MyOptional instance. Example Inputs & Outputs: Initialization Input: let myString: MyOptional<String> = MyOptional.some("Hello") Output: An instance of MyOptional holding the string "Hello". Input: let myNil: MyOptional<String> = MyOptional.none Output: An instance of MyOptional representing none. Unwrapping Input: myString.unwrap(default: "Default") Output: "Hello" Input: myNil.unwrap(default: "Default") Output: "Default" Technical Requirements: Use Swift as the programming language. Make sure your custom optional type is generic and can work with any data type. Ensure that your implementation is safe and follows Swift's error-handling and type-checking best practices. Ref: enginebogie.com/public/question/implementing-a-custom-optional-type-in-swift/730

Nice video. Would be good to show optional chaining usage etc. ? And !

import Foundation func testDispatch() { print ("1") DispatchQueue.global().async{ print("2") DispatchQueue.main.async{ print("3") } print("4") DispatchQueue.main.sync{ print("5") } DispatchQueue.main.async{ print ("6") DispatchQueue.main.sync{ print ("7") } } print ("8") } print ("9") } testDispatch()

yor playlist is amazing, make more such short videoed playlists:)

Awesome.

I was asked similar question in an interview and was not able to answer it. Thanks for making a detailed explanation on this topic.

thanks !! clear explanation. A better solution could have been by creating an extension on Collection, so that it can be used like Swift map function

can you explain more example

Nice

Keep the good work mate... can we expect something on unit test case with TEST DOUBLE and how respective can be used.. small xcode project would help.. apologies for such ask but really wana see your approach

Great video, the song between your dialogs is louder than your voice which is annoying. Please consider it for your next videos. thanks

Nice video. What if I want to reuse the same method to add 2 strings (concatenate the 2 strings) ? What protocol should be used in that case?

Simple and neat. Thanks !

it will more help full if you also add DS questions ☺️

superb content

nice..