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For and Nested Loops

Explore the use of for loops and nested loops in JavaScript to perform repetitive operations. Understand how initialization, condition, and update work together in for loops and how nested loops run inner loops multiple times per outer loop iteration. This lesson helps you develop skills to construct complex repetitive code and solve practical problems like creating multiplication tables.

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For loops

For loops are one of the most common types of loops and can be found in most programming languages. They take the following form:

for (initialization ; condition ; update) {
  // do something
}

Three things get set inside the parentheses:

  • The initialization code is run before the loop starts and is usually employed to initialize any variables that are used in the loop.
  • The condition has to be satisfied for the loop to continue.
  • The update code is what to do after each iteration of the loop, and it is typically used to update any values.

This process is illustrated in the following diagram.

Working of for loop
Working of for loop

For the Ten Green Bottles song, we would have to initialize the number of bottles to 1010. The condition would be that this number has to be more than zero and the update code would be to reduce the number of bottles by 11. This is shown in the diagram above. ...

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