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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.
until_expression is a relational expression that is evaluated for a true or false condition. The )DO loop continues while the until_expression evaluates to a false condition. The test is performed at the end of each loop prior to updating the control variable. The loop is always performed at least once.