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Event manager

Write event emitter-base class that allows you to add event listeners

Custom events

Events can be created with the Event constructor as follows:

let event = new Event(type[, options]);





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sum(a, b)/ sum(a)(b)


Once method (implement a function that can be called only once)

Arrays, Objects, and Strings are commonly used types that we iterate using ‘for’. ‘for…in’, ‘for…of’ statements.

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Array iteration

  1. for

Repeats until a specified condition evaluates to false.

for ([init]; [condition]; [increment])

“All the three blocks in the for loop can be omitted. But should be declared before.”

2. for…of

for (variable…


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Recursive function example 1 — factorial

Recursive function example 2 — Fibonacci

Recursive function example 3 — Decimal to binary conversion

Pascal triangle

I liked the below reference to generate the pascal triangle one row at a time using 2 functions:

Strings coding questions and answers

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String Reverse

Reverse Words




Given a sentence, “Hello how are you HELLO”. Find the minimum distance between two words. Given input: hello, you. Output: 1. The input words are case insensitive (levenshteinDistance (s, t))

Array related questions and answers from brute force to better optimal way of achieving Big O

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Find the maximum value of an array

Remove duplicate from an array/ unique array

Get duplicates from an array

Flatten the array

Find the median value of an array

Find two sum of an array twoSum(arr, sum)

Maximum consecutive sum of integers in an array

Union of arrays (merge two arrays without duplicates)

Intersection of arrays/ find common values of arrays (multidimensional)

Sathish Kumar Arumugam

Senior User Interface Engineer at Aruba Networks

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