Medium data structure and algorithm practice puzzle.
Given [measured, target, tolerance], return true if the measurement is within tolerance of the target. Take the absolute difference between measured and target, and check that it's no more than the tolerance. Tests that compare decimals use the same idea, because exact equality is usually the wrong question.
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.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Event Audit Trail, a pipeline you can run and download. See every Software Engineer project.
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