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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.
The do-while loop. The do-while loop is similar to the while loop, except that the test condition occurs at the end of the loop. Having the test condition at the end, guarantees that the body of the loop always executes at least one time. The format of the do-while loop is shown in the box at the right. The test condition must be enclosed in parentheses and FOLLOWED BY A SEMI-COLON.