Linkedin UI Round

Round 1 - Initial Screeningfunction Foo(x) { function bar() { return x; } this.baz= function() { return x; } } Foo.prototype.baz = function() { return x; } //let y = new Foo(); y.baz() // equals ? y.bar() // equals ?

Discussed on prototypical inheritance, closures, function expressions, constructor functions and this. Asked how we could make above code work on all scenarios ?

Q2: Implement Standard memonization function

Q3: Implement People you may know component .Image link : This needs to be done in plain CSS, JS , HTML. Pay attention to semantic tags.Asked about CSS . The working code needs to be implemented in coderpad . Clicking see more, should trigger API call and append more nodes. Closing / clicking Connect should close that node. Tip: They would definitely ask about how you can optimize event handlers . Talk about event delegation and tradeoffs on putting event handler at root container vs child container

Round 2: Pragmatic Coding

It was a tooltip over a link.

Round 3 DS Algo

Return the start and end index as well for above problem

Implement String.repeat(times) function . The repeat should get repeat str x times.

let str = 'string'; console.log(str.repeat(3)) // stringstringstring

Came up with O(n) initially . Then asked to optimize it . Using recusrion did it in O(log(n)) . Also said you can ignore the complexity of template literal concatenation . There was also discussion abour this , call, apply and bind

Round 4 JS

This was the round which I expected to make max impact but it ended up opposite. Implement tuple function which would take string and convert it as a tuple and then it should support an operation multiply(n) which would multiple ith item of each tuple.

const str = `(1, 2, 3) , (4, 5, 6) , (7, 8, 9) `; // Convert it into [[1, 2, 3], [4, 5, 6], [7, 8, 9]]const x = tuple(str); console.log(x.multiply(2)); // Multiples 2nd item in each tuple . ie 2 * 5 * 8

Was not sure how to use regexp and str.split() function as I usually google such questions . Wrote a function which would parse that string and convert it to 2-D array . ie iterate through strnig , if character is ( do this , else do that ...

Q2

console.log(1 + function x() { alert("Hi")})

What would be output of above function ? I knew some sort of type coercion would happen and some strings would be printed . Just said like that as I have never added a function to a number in 4 years of my career . They wanted output to be modified to : 1start:function x() { alert("Hi")}:end. The task was to override toString method based on revealing module pattern using IFFE and closures. Took about 30 minutes to do this and lot of hints from interviewers . With this one question they gave a negative feedback on my JS round

Round 5 UI design

Design a calculator that supports undo feature. ie it can undo to any depths . ie `

3+4= 77*2 = 14

If we are at 14 , pressing undo button should go upto intial state . Then asked it to convert it to kind of 3rd party util to be consumed at LinkedIn feeds. Its straight forward stack data structure. Implemented it just as an HOC , which would accept the callback function that needs to be executed on undo. The library also should support direct undo to state i;

Round 6 Technical Sense

Asked about current work accessibility, performance, responsiveness . How they were implemented ? How you analyze user data, XD inputs, PM discussions etc . Then about apps that I use daily , how they could be improved ...

Round 7 Managerial

Usual behaviural questions, mentoring experience, tell about a project which gave high business impact, which you are proud off , how you handle conflicts etc.

HR called and said got mixed feedbacks from interviewers . Did well in DS , design and HTML / CSS rounds, but need to improve JS ( with just that 1 question ) . Ultimately decided to not continue :) .