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What is a slice in Swift and how does it differ from an array?
From the documentation, the type signature of subscript(Range) is:
subscript(Range<Int>) -> Slice<T> Why not return another Array<T> rather than a Slice<T>?
It looks like I can concatenate a slice with an array:
var list = ["hello", "world"] var slice: Array<String> = [] + list[0..list.count] But this yields the error:
could not find an overload for 'subscript' that accepts the supplied arguments
var list = ["hello", "world"] var slice: Array<String> = list[0..list.count] What is a slice?
787
Overview. The ArraySlice type makes it fast and efficient for you to perform operations on sections of a larger array. Instead of copying over the elements of a slice to new storage, an ArraySlice instance presents a view onto the storage of a larger array.
The slice() method returns a shallow copy of a portion of an array into a new array object selected from start to end ( end not included) where start and end represent the index of items in that array.
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slice is a composite data type and because it is composed of primitive data type (see variables lesson for primitive data types). Syntax to define a slice is pretty similar to that of an array but without specifying the elements count. Hence s is a slice.
The slice points into the array. No point making another array when the array already exists and the slice can just describe the desired part of it.
The addition causes implicit coercion, so it works. To make your assignment work, you would need to coerce:
var list = ["hello", "world"] var slice: Array<String> = Array(list[0..<list.count]) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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