Go (golang) Tutorials - Slices (Part 1)

Published: 26 March 2018
on channel: Ambasoft Java

275

#golang #go #slices

Slices - An abstraction over the static arrays, using which we can perform dynamic operations on the arrays
--------
1. Creating a slice with its length specified
2. Declare slice with slice literal
3. nil slice
4. empty slice
5. slice of slices
a) Slice A with a set of values
b) Slice B from slice A
c) Perform operations and access on Slice B and let us see how it affects Slice A
6. Length & capacity
7. Effects of making changes to a slice
Every change happening in the new slice will have corresponding change reflected in the source slice

slicedemo.go
-----------

package main
import "fmt"
func main(){
//Slice - 1.Pointer, 2.length, 3.capacity
var a []int //Declare a variable "a" which is an integer slice - Pointer will be nil - nil slice
b:=make([]int,5) //Declaration as well as instantiation of a new slice b of type integer
c:=make([]int,0) //Slice Instantiation - Pointer will be pointing to a new address for the slice - Empty slice
d:=[]int{10,20,30,40,50} //Go compiler dynamically identifies the length of the slice "d" based on the number of values we initialize
fmt.Printf("The length of a is %d, The length of b is %d, The length of c is %d, the length of d is %d\n",len(a),len(b),len(c),len(d))

}

slicetest.go
--------------
package main
import "fmt"
func main(){
x:=make([]int,5,7) //Capacity for a slice should always be smaller or equal to the slice length
a:=[]int { 100,200,300,400,500} //0-100,1-200,2-300,3-400,4-500
b:=a[1:3] // Create a new slice "b" from an existing slice "a" from the index[1:] 1 upto the length of the slice is the capacity of b. The length is [:3] which means, until the third
//index of slice a should be the length of slice b
fmt.Printf("The length of a is %d, the capacity of a is %d\n",len(a),cap(a))
fmt.Printf("The length of x is %d, the capacity of x is %d\n",len(x),cap(x))
fmt.Printf("The length of b is %d, the capacity of b is %d\n",len(b),cap(b))
b[1]=1000 //b[0] is pointing to a[1]. changes to b[0] or any index of b will have a corresponding change gets reflected in "a"
//Use For loop
fmt.Println(a[i])

}

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