How to assign length to slice in golang

There are two concepts in slices: one is the len length, and the other is the cap capacity. The length refers to the maximum subscript 1 that has been assigned a value. It can be used through the built-in function len() get. Capacity refers to the maximum number of elements that the slice can currently hold, which can be obtained through the built-in function cap().

Slices can be initialized through arrays or through the built-in function make(). When initializing, len=cap. When appending elements, if the capacity cap is insufficient, the capacity will be expanded by 2 times of len.

s :=[] int {1,2,3 }

Directly initialize the slice, [] indicates the slice type, {1,2,3} initialization value is 1,2,3 in order. Its cap=len=3

s := arr[:]

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

s := arr[startIndex:endIndex]

Create the elements in arr from subscript startIndex to endIndex-1 as a new slice

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