What is a JavaScript callback function?
Front End Software Engineer Interview Questions
20,789 front end software engineer interview questions shared by candidates
How to center a 200px x 200px div to the center of the screen?
Given a number n where n+1 and n-1 are prime, prove n is divisible by 6
Say there was a function that took 1 second to execute and you needed to run this function 10 million times, how would you cut down on the execution time?
As a designer, did I think I would get bored with coding and troubleshooting?
If we wanted to implement a method of tracking every click that the user made on the site, how would we want to do this?
What is== and === operator?
Given an input array and another array that describes a new index for each element, mutate the input array so that each element ends up in their new index. Discuss the runtime of the algorithm and how you can be sure there won't be any infinite loops.
Given input: // could be potentially more than 3 keys in the object above items = [ {color: 'red', type: 'tv', age: 18}, {color: 'silver', type: 'phone', age: 20} ... ] excludes = [ {k: 'color', v: 'silver'}, {k: 'type', v: 'tv'}, .... ] function excludeItems(items, excludes) { excludes.forEach(pair => { items = items.filter(item => item[pair.k] === item[pair.v]); }); return items; } 1. Describe what this function is doing... 2. What is wrong with that function ? 3. How would you optimize it ?
Why do you want to work at Costco?
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