Iterator method
An iterator method is an operation that returns an iterator for traversing the elements of a collection or iterable.
Learn Rust in a Month of Lunches
iter is a Rust collection method that returns an iterator yielding immutable references to the collection's items.
- How it is used
- Uses `.iter()` to read collection items one at a time without taking their values.
- How deep it goes
- Works through reference iteration, `.next()`, and lazy `.map()` chains, but defers a fuller explanation of closures.
- Examples
- Shows vector traversal, a transformed vector, successive `.next()` results, and a compiler warning for an unused iterator.
- What you can do after
- Apply it via Rust’s `.iter()` to read vector items without consuming the original or to collect transformed items into a new vector.
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Python How-To
iter is a Python built-in function that returns an iterator for an iterable object or raises an exception when the object is not iterable.
- How it is used
- Uses iter() to convert iterable objects into iterators for explicit, stepwise iteration or iterability checks.
- How deep it goes
- Traces iterator creation, successive next() calls, exhaustion, and automatic handling inside for loops.
- Examples
- Demonstrates iter() with lists, integers, and common built-in iterable types including strings, tuples, dictionaries, sets, ranges, maps, and filters.
- What you can do after
- Apply iter() and next() to inspect iterability and retrieve iterable elements one at a time.
Related concepts
- iteratorproduces · An iterator is an object or abstraction that provides successive values from a sequence or data source through a traversal protocol.
- iterablemeasures · An iterable is an object or value that provides or supports a protocol for producing its elements sequentially.
- __iter__uses · __iter__ is a Python special method that returns an iterator for an object.
- referenceuses · A reference is an indirect value or relationship that identifies or provides access to another value, object, resource, or source.
- try-catch statementused by · A try-catch statement is a control-flow construct that executes code under exception handling and transfers control to a matching handler when an exception is raised.
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