Iterators in Go
a year ago
- #Iterators
- #Programming
- #Go
- Go iterators are functions that yield one result at a time, rather than computing all results upfront.
- Iterators are useful for efficiency, as they avoid allocating memory for entire slices and computing unused elements.
- An iterator function in Go takes a 'yield' function as a parameter, which it calls to produce each value.
- The 'iter' package in Go provides 'Seq' and 'Seq2' types for single-value and two-value iterators, respectively.
- Iterators can handle errors by yielding a value alongside an error, similar to traditional Go functions.
- Iterators must check the 'yield' function's return value to know when to stop and perform cleanup.
- Iterators can be composed, allowing functions to take and return iterators for flexible programming.
- Compared to channels, iterators are simpler and avoid concurrency issues and resource leaks.
- The Go standard library has been updated to include iterator support in the 'slices' and 'maps' packages.