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This article introduces the relevant knowledge of "how to define and initialize Go language slices". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Go language slicing is an abstraction of arrays.

Go array length can not be changed, in a specific scene such a collection is not suitable, Go provides a flexible, powerful built-in type slice ("dynamic array"), the length of the slice is not fixed compared with the array, you can add elements, when appended may increase the capacity of the slice.

Define slicing

You can declare an array of unspecified sizes to define slices:

Var identifier [] type

The length of the slice does not need to be specified.

Or use the make () function to create a slice:

Var slice1 [] type = make ([] type, len) can also be abbreviated as slice1: = make ([] type, len)

You can also specify the capacity, where capacity is an optional parameter.

Make ([] T, length, capacity)

Where len is the length of the array and also the initial length of the slice.

Slice initialization s: = [] int {1pm 2pm 3}

Initialize the slice directly, and [] indicates that it is the slice type. The initialization value of {1Mage2Pol 3} is 1Magne2Pol 3 in turn, its cap=len=3.

S: = arr [:]

Initialize slice s, which is a reference to the array arr.

S: = arr [startIndex:endIndex]

Create a new slice of the element in arr from subscript startIndex to endIndex-1.

S: = arr [startIndex:]

The default endIndex represents the last element up to arr.

S: = arr [: endIndex]

The default startIndex will start with the first element of the arr.

S1: = s [startIndex:endIndex]

Initialize slice S1 with slice s.

S: = make ([] int,len,cap)

The slice s is initialized with the built-in function make (), and [] int is identified as the slice whose element type is int.

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