Added a new JS section question

04 - JS/what-is-the-difference-bewteen-while-and-do-while-loops-in-javascript.md

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+A while loop will only begin to execute if the conditional statement in the while statement is true.
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+A do while loop will always execute its contents at least once, regardless of whether the conditional statement is true.
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+In other words, a while loop checks the conditional statement at the beginning of the loop, while a do while loop will check the statement at the end.