Go/Arrays: Difference between revisions
From charlesreid1
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Go blog post: arrays, slices, and strings: https://blog.golang.org/slices | Go blog post: arrays, slices, and strings: https://blog.golang.org/slices | ||
= | =Basics= | ||
==Initialization== | |||
To initialize an array, use the familiar square bracket notation. | |||
<pre> | |||
var keys []int | |||
for k := 0; k < 10; k++ { | |||
keys = append(keys, k) | |||
} | |||
</pre> | |||
In this way, we can think of Go's built-in array data structure as being a bit like Java's ArrayList data structure, in that it provides high-level methods that don't require the user to re-allocate space every time. | |||
==Array size is a part of the type== | ==Array size is a part of the type== | ||
An important characteristic of arrays is that their size is a part of their type. | An important characteristic of arrays is that their size is a part of their type. | ||
"Arrays are not often seen in Go programs because the size of an array is part of its type, which limits its expressive power." | |||
The two variables defined here are of two distinct types: | The two variables defined here are of two distinct types: | ||
Revision as of 21:34, 13 December 2018
Go blog post: arrays, slices, and strings: https://blog.golang.org/slices
Basics
Initialization
To initialize an array, use the familiar square bracket notation.
var keys []int
for k := 0; k < 10; k++ {
keys = append(keys, k)
}
In this way, we can think of Go's built-in array data structure as being a bit like Java's ArrayList data structure, in that it provides high-level methods that don't require the user to re-allocate space every time.
Array size is a part of the type
An important characteristic of arrays is that their size is a part of their type.
"Arrays are not often seen in Go programs because the size of an array is part of its type, which limits its expressive power."
The two variables defined here are of two distinct types:
var buffer [256]byte var buffer2 [512]byte
This is because the size of the array is allocated at initialization time. You can use the square bracket syntax to access elements of an array, buffer[0] through buffer[255]. The program crashes if you access an index outside of its range.
Array slices
See Go/Slices
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Go/Lists · Go/Maps · Go/Stacks · Go/Queues
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