REBOL Programming/Design Guide/Take advantage of return values

From Wikibooks, the open-content textbooks collection

Many functions return useful values.

For instance, the INSERT function returns the series just past the insertion.

IF, EITHER, and most of the looping functions return the value of the block they evaluated.

>> j: 0
== 0
>> print foreach entry [red green blue water aqua] [j: j + 1]
5