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while Loops

Awesome job! for loops are great, but they have a limitation: you have to know how many times you want the loop to run. What if you want a loop to run an unknown or variable number of times instead?

For example, if we have a deck of cards and we want to flip cards (loop a card flipping function) until we get a 'Spade', how could we write that in JavaScript?

That's the purpose of the while loop. It looks like similar to a for loop. Check it out:

while (condition) { // code block that loops until condition is false }
  1. The loop begins with the keyword while

  2. Inside the parentheses, we can insert a condition. As long as the variable evaluates to true the block of code will loop.

  3. Inside the code block we can write any code we'd like to loop.

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