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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.
A do...while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least one time. Syntax. Following is the syntax of a do...while loop â do { // Statements }while(Boolean_expression);