What does *10 means in this code

function randomWholeNum()


return Math.floor(Math.random() * 10);




Multiply the return value of Math.random() by 10.

Math.random returns a number between 0 and 1, which unless it returns 0 will be a decimal smaller than 1. Multiplying by 10 just moves the decimal point over one to the right, so instead of 0.7753337570110278 you have 7.753337570110278.

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The asterisk sign is how you do multiplication in JS.