Web Reference: Jul 31, 2025 · This code defines a self-invoking function that returns a facto function, which calculates the factorial of a number while using caching for efficiency. The cache object stores previously calculated results to avoid redundant computations. In this example, you will learn to write a JavaScript program to calculate the factorial of a number. The code above first defines two variables, factorialNumber and factorial. factorial is initialized with 1. factorialNumber will get the result of the prompt (a number is expected) and then, using a cycle, in each step, factorial is multiplied with the index of the step, which is represented by i.
YouTube Excerpt: In this video, you will learn how to write a function to compute
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