Continuing the discussion from freeCodeCamp Challenge Guide: Smallest Common Multiple: [image]freeCodeCamp Challenge Guide: Smallest Common Multiple const factors = {}; The factors variable has a memory persisting through different function calls. For example, when getPrimeFactors(4) is called, (for the test case [1, 5]) the factors[2] is incremented. It returns {‘2’: 2} instead of {‘2’: 1}. What type of variable is factors? It is able to remember the previous getPrimeFactors(2) and return {‘2’: 2} for getPrimeFactors(4). I would like to read the documentation and learn more, but I do not know what to look up.

[image]freeCodeCamp Challenge Guide: Smallest Common Multiple const factors = {}; its just an object, it will keep track of which number has previously showed up and increment it by 1, if not found in “factors” variable then it creates a new entry with that number with value of 1 [image] laurencollins1109: It returns {‘2’: 2} instead of {‘2’: 1}. for which code it returns so?

Thank you for your response! Solution 4 of the “…Guide: Smallest Common Multiple” linked in the original post is the code I’m referring to. The object is initiated and set to empty for each function call. I still don’t understand how it returns {‘2’: 2}.

[image] laurencollins1109: For example, when getPrimeFactors(4) is called, (for the test case [1, 5]) the factors[2] is incremented. It returns {‘2’: 2} instead of {‘2’: 1}. Why should it only have 2 appering once? 4 has a prime factorization of 2*2

I messed up when writing the tracing table. Thank you for your help

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bappyasif May 11, 2023, 11:56am 2

its just an object, it will keep track of which number has previously showed up and increment it by 1, if not found in “factors” variable then it creates a new entry with that number with value of 1

for which code it returns so?

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