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13,311 frontend software engineer interview questions shared by candidates

Given an array of ranges [x,y] Return array of groups, each group will hold an array of the overlapping ranges. By range [x,y] we mean all the numbers between x and y. For example [2,5] - all the numbers between 2 and 5. Example: [[6,9], [2,5], [3,4], [1,3]] => [ [[1,3], [2,5], [3,4]], [[6,9]] ] [[2,6], [8,10], [5,7], [1,3], [10,15], [20,30], [25,27], [30,100]] => [ [[2,6], [5,7], [1,3]], [[8,10], [10,15] ],[[20,30], [25,27], [30,100]]]
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Frontend Developer

Interviewed at Axonius

3.8★
May 27, 2025

Given an array of ranges [x,y] Return array of groups, each group will hold an array of the overlapping ranges. By range [x,y] we mean all the numbers between x and y. For example [2,5] - all the numbers between 2 and 5. Example: [[6,9], [2,5], [3,4], [1,3]] => [ [[1,3], [2,5], [3,4]], [[6,9]] ] [[2,6], [8,10], [5,7], [1,3], [10,15], [20,30], [25,27], [30,100]] => [ [[2,6], [5,7], [1,3]], [[8,10], [10,15] ],[[20,30], [25,27], [30,100]]]

1 What is the essence of Reducer in react @@ What is middleware in react.@@ What are the type of js 4 What's the greatest usage in js. What is the data structure that you use most often in your work @@ 6 What can make "unsynchronized" look like "synchronized" 7. what's difference between "display" and "visibility".
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Senior Frontend Developer

Interviewed at Scotiabank

3.8★
Oct 16, 2021

1 What is the essence of Reducer in react @@ What is middleware in react.@@ What are the type of js 4 What's the greatest usage in js. What is the data structure that you use most often in your work @@ 6 What can make "unsynchronized" look like "synchronized" 7. what's difference between "display" and "visibility".

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