Go-Basic Knowledge Three

This is a creation in Article, where the information may have evolved or changed.

This article mainly summarizes the Array,slice,map.

One: An array is a definition of:

var arr[n] type where n represents the length of the array, type represents the types of the stored elements, operations of the array are read or assigned by []

Two: "Dynamic array" in Go is called slice,slice is not a dynamic array in real sense, but a reference type.

Slice always points to an underlying Array,slice declaration can also be like an array, just without the need for length.

Note that when declaring an array, the length of the array is indicated in square brackets or with ... The length is automatically calculated, and when the slice is declared, there are no characters in the square brackets.

since slice is a reference type, when a reference changes the value of one of its elements, all other references will change this value. such as:

Slice stitching:

Three: Map is the concept of a dictionary, format: map[keytype]valuetype