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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 ImageJ macro language has three looping statements: 1  for - runs a block of code a specified number of times. 2  while - repeatedly runs a block of code while a condition is true. 3  do...while - runs a block of code once then repeats while a condition is true.