Swift BasicsLesson 18Free preview

Swift For Loop

This lesson is part of Swift · All levels

Summary

This lesson reviews the 'for-in' repetition in Swift that is used to iterate the sequence of a number array, array element, dictionary, or string. For-in at Swift is very flexible and secure because it eliminates the risk of out-of-bounds index. If the repetition variable is not required, the developer can replace it with the underscore sign (_).

Key points

The 'for-in' iteration iterates on each item within the range or data collection
Use the bottom line '_' as a substitute for the variable if the value is not required
The 'stride(from:to:by:)' function facilitates repetition with custom step intervals
Can iterate key-value pairs in the Dictionary simultaneously

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