Easy data structure and algorithm practice puzzle.
Given the bytes of an integer in memory order and whether the machine is little endian, return the integer. Big endian puts the most significant byte first, the way we write numbers. Little endian puts it last, which is what x86 and ARM do. If it's little endian, reverse the bytes. Then for each byte, multiply your total by 256 and add the byte.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
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