Reduce Activity in Loops

Loops are often used in programming.

Each statement in a loop, including the for statement, is executed for each iteration of the loop.

Statements or assignments that can be placed outside the loop will make the loop run faster.

Bad:

Better Code:

The bad code accesses the length property of an array each time the loop is iterated.

The better code accesses the length property outside the loop and makes the loop run faster.

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