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#1 Valid palindrome

easy10 mins

#2 Array.prototype.map

medium20 mins

#3 Filter 'red' with Specific Letters

easy10 mins

#4 Flatten array

medium20 mins

#5 Debounce

medium20 mins

#6 Count Items in a String

easy10 mins

#7 Create a tree

easy10 mins

#8 Sum pairs

medium20 mins

#9 Contains

medium20 mins

#10 Max profit

medium20 mins

#11 Group By

medium20 mins

#12 Get Coins

medium20 mins

#13 Get Minimum Jump

hard30 mins

#14 Is Anagram

easy10 mins

#15 Fix Files

easy10 mins

#16 Choose Best Pair

medium20 mins

#17 Can Carry

hard30 mins

#18 Is action possible

medium20 mins

#19 Is same tree

easy10 mins

#20 One-to-one string transformation

easy10 mins

#21 Sum Tree Values

easy10 mins

#22 Wrap strings in a border

easy10 mins

#23 Count weekday holiday hours

easy10 mins

#24 Calculate maximum loads

easy10 mins

#25 Can nest boxes

medium20 mins

#26 Find maximum subset sum with constraints

hard30 mins

#27 Draw an ASCII cube

medium20 mins

#28 Find items exclusive to one array

easy10 mins

#29 Check almost palindrome

medium20 mins

#30 Simulate cascading activation

easy10 mins

#31 Validate single peak sequence

medium20 mins

#32 Calculate completion fraction from time strings

hard30 mins

#33 Find optimal element under resource constraint

medium20 mins

#34 Find modified file IDs after backup

easy10 mins

#35 Find minimum path sum in a triangle

medium20 mins

#36 Build a character triangle from a base row

medium20 mins

#37 Format text with multiple rules

hard30 mins

#38 Group items by name-length weight limit

medium20 mins

#39 Find numbers containing a specific digit

easy10 mins

#40 Sort items by target positions

easy10 mins

#41 Calculate required carriers with constraints

hard30 mins

#42 Format an ASCII table dynamically

medium20 mins

#43 Verify strictly increasing group steps

easy10 mins

#44 Execute 8-bit CPU instructions

hard30 mins

#45 Find path through a maze

hard30 mins

#46 Find first repeated element

easy10 mins

#47 Filter items by available materials

easy10 mins

#48 Find the extra step in a modified sequence

easy10 mins

#49 Decode parentheses by reversing content

medium20 mins

#50 Simulate movement along a road with barriers

medium20 mins

#51 Calculate maximum distance from movement commands

easy10 mins

#52 Draw a 3D ASCII gift box

easy10 mins

#53 Organize items by quantity into storage units

medium20 mins

#54 Minimize changes for alternating colors

easy10 mins

#55 Draw a centered ornament tree with trunk

easy10 mins

#56 Find a single swap to make a palindrome

medium20 mins

#57 Validate degraded character copy

medium20 mins

#58 Calculate remaining time from duration strings

easy10 mins

#59 Find maximum sum of non-adjacent elements

medium20 mins

#60 Navigate a grid avoiding obstacles

medium20 mins

#61 Convert level-order array to binary tree

easy10 mins

#62 Merge overlapping intervals

easy10 mins

#63 Draw a digital clock display

hard30 mins

#64 Count adjacent markers in a grid

medium20 mins

#65 Distribute values using neighbor averaging

hard30 mins

#66 Find the longest balanced binary segment

medium20 mins

#67 Interpret a simple command language

easy10 mins

#68 Group items by shared elements

easy10 mins

#69 Generate all step sequences to reach a total

medium20 mins

#70 Calculate total distance visiting ordered waypoints

medium20 mins

#71 Remove duplicates and sort ascending

easy10 mins

#72 Draw a rectangular frame around text lines

easy10 mins

#73 Group and sum items by category

easy10 mins

#74 Build a character pyramid with trunk

medium20 mins

#75 Match pairs by type and size

easy10 mins

#76 Locate a marker inside a bordered region

medium20 mins

#77 Reverse substrings inside nested parentheses

medium20 mins

#78 Render an isometric race track with positioned markers

easy10 mins

#79 Simulate directional movement on a grid with collision detection

medium20 mins

#80 Execute a minimal register-based instruction set

medium20 mins

#81 Extract clean filename from encoded string

easy10 mins

#82 Compute value from symbol sequence with subtraction rule

easy10 mins

#83 Simulate 2D movement with special modifiers

hard30 mins

#84 Calculate minimum total distance to pair elements

easy10 mins

#85 Render an array of objects as a formatted ASCII table

easy10 mins

#86 Eliminate adjacent duplicate characters

easy10 mins

#87 Compute adjacent element counts in a boolean grid

medium20 mins

#88 Parse and query structured contact records from text

hard30 mins

#89 Optimally pack weight into minimal box units

hard30 mins

#90 Find missing and extra elements between two lists

easy10 mins

#91 Calculate the height of a binary tree

easy10 mins

#92 Generate all non-empty combinations preserving order

medium20 mins

#93 Identify missing integers within a range

easy10 mins

#94 Verify if two binary trees are mirror images

medium20 mins

#95 Execute a minimal instruction-based program

medium20 mins

Katas

Master the patterns that top tech companies test in real interviews. Each kata targets a specific JavaScript or TypeScript concept, designed to sharpen your problem-solving skills through deliberate practice.

No timers, no scores, no pressure. Just you, the code, and a growing collection of hand-picked challenges that get progressively harder as you improve.

Consistency beats intensity. Practice one kata a day and watch your interview confidence compound.

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