Golang : Find commonalities in two slices or arrays example
Problem:
You have two slices of the same length and you want to find out if they have similar/common items.
Solution :
- Iterate items of the first slice.
- Get the index number.
- Use the index number to get the second slice item.
- Compare the items.
- If similar or common, then add the item to a new slice.
- Loop until no more item in the first slice.
Here you go!
package main
import (
"fmt"
)
// NOTE : This example will only work if the length of slice a == length of slice b
// In production, make sure to check the length and capacity of the slices
// before comparing.
func main() {
a := []string{"Hello", "No", "Cheers"}
fmt.Println("Slice a : ", a)
b := []string{"Hello", "Yes", "Cheers"}
fmt.Println("Slice b : ", b)
// compare a to be and find common items
// and store into c
c := []string{}
for i := range a {
if a[i] == b[i] {
c = append(c, a[i])
}
}
fmt.Println("Common items : ", c)
// compare a to be and find item not in a
// and store into d
d := []string{}
for i := range a {
if a[i] != b[i] {
d = append(d, a[i])
}
}
fmt.Println("Item that a has over b ", d)
// compare a to be and find item not in b
// and store into e
e := []string{}
for i := range b { // iterate b instead of a
if a[i] != b[i] {
e = append(e, b[i])
}
}
fmt.Println("Item that b has over a ", e)
}
Output :
Slice a : [Hello No Cheers]
Slice b : [Hello Yes Cheers]
Common items : [Hello Cheers]
Item that a has over b [No]
Item that b has over a [Yes]
NOTES: This example will only work if the length of slice a == length of slice b. In production, make sure to check the length and capacity of the slices before comparing.Otherwise, you will get panic: runtime error: index out of range
error.
References :
See also : Golang : How to count duplicate items in slice/array?
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+16.4k Golang :Trim white spaces from a string
+7.1k Nginx : How to block user agent ?
+6.3k Javascript : Generate random key with specific length
+11.3k Golang : Fix - does not implement sort.Interface (missing Len method)
+10.5k Swift : Convert (cast) String to Integer
+6.1k Golang : Missing Subversion command
+8.9k Golang : HTTP Routing with Goji example
+52.6k Golang : How to get struct field and value by name
+6.9k Mac OSX : Find large files by size
+22.3k Golang : Securing password with salt
+7k Nginx : Password protect a directory/folder
+10.6k Golang : Bubble sort example