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Instead of adding several almost equal lines in a script we can use loops to perform a task like this. In JavaScript there are two different kind of loops: for - loops through a block of code a specified number of times. while - loops through a block of code while a specified condition is true.
Loops in JavaScript are used to execute the same block of code a specified number of times or while a specified condition is true. Very often when you write code, you want the same block of code to run over and over again in a row.