Pattern4 visualizers
Recursion Pattern Visualizers
The Recursion pattern is a recurring algorithmic shape that appears across coding interviews and competitive problems. Use it when the problem geometry matches its trigger conditions — recognizing the pattern collapses what looks like a hard problem into a familiar template. These visualizers trace Recursion step-by-step on classics such as Factorial of N, Power of Two, Sum of All Numbers in Array, so you can internalize the moves before you ever need them under pressure.
Recursion
Factorial of N
Compute n! by multiplying n with the recursive factorial of n-1.
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Recursion
Power of Two
Determine if a number is a power of 2 by recursively halving it.
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Recursion
Sum of All Numbers in Array
Recursively sum the elements of an array by moving an index to the base case.
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Recursion
Sum of First N Numbers
Sum numbers down to 0 using a basic recursive call stack.
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