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HomeSoftware EngineeringEasy methods to Take away Duplicates in an Array in Golang

# Easy methods to Take away Duplicates in an Array in Golang

## The problem#

Take away the left-most duplicates from a listing of integers and return the end result.

``````// Take away the three's at indices 0 and three
clear up([3, 4, 4, 3, 6, 3]); // => [4, 6, 3]
``````

Possibility 1:

``````package deal answer

func Clear up(arr []int) (res []int) {
visited := map[int]bool{}
for i := len(arr) - 1; i >= 0; i-- {
n := arr[i]
if visited[n] { proceed }

visited[n] = true
res = append([]int{n}, res...)
}

return
}
``````

Possibility 2:

``````package deal answer

func Clear up(arr []int) []int {
counts := make(map[int]bool)
for _,x := vary arr {
counts[x]=true
}
end result := make([]int,len(counts))
j := len(end result)-1
for i := len(arr)-1; i>=0; i-- {
if counts[arr[i]] {
counts[arr[i]] = false;
end result[j] = arr[i]
j--
}
}
return end result
}
``````

Possibility 3:

``````package deal answer

func Clear up(a []int) (r[]int) {
m:=map[int]int{}
for _,v:=vary a{ m[v]++ }
for _,v:=vary a{
if m[v]==1{
r=append(r,v)
}
m[v]--
}
return
}
``````

## Check circumstances to validate our answer#

``````package deal our_test

import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
. "codewarrior/kata"
)

func dotest(arr , exp []int) {
var ans = Clear up(arr)
Anticipate(ans).To(Equal(exp))
}

var _ = Describe("Instance assessments", func() {
It("It ought to work for primary assessments", func() {
dotest([] int{3,4,4,3,6,3}, []int{4,6,3})
dotest([] int{1,2,1,2,1,2,3}, []int{1,2,3})
dotest([] int{1,2,3,4}, []int{1,2,3,4})
dotest([] int{1,1,4,5,1,2,1}, []int{4,5,2,1})
dotest([] int{1,2,1,2,1,1,3}, []int{2,1,3})
dotest([] int{0,4,4,3,0,3}, []int{4,0,3})
})
})
``````
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