How to iterate through a slice in Golang
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In this shot, we will learn how to iterate through a slice in Golang.
A slice is a dynamically-sized array. It can grow or shrink if we add or delete items from it.
We can iterate through a slice using the for-range loop.
Syntax
for index, element := range slice {
//do something here
}
The range returns two values, which are the index and element of the current iteration.
If we don’t need to use an index, then we can use _, as shown below:
for _, element := range slice {
//do something here
}
Example
In this example, we will calculate the sum of the numbers in a slice by iterating through it.
Code
package main//program execution starts herefunc main(){//declare a slice of numbersn := []int{10,20,30,40,50}//declare a variable sumsum := 0//traverse through the slicefor _,element := range n{//add present element to sumsum += element}//display the sumprint(sum)}
Code explanation
-
Line 4: Program execution in Golang starts from the
main()function. -
Line 7: We declare and initialize the slice of numbers,
n. -
Line 10: We declare and initialize the variable
sumwith the0value. -
Line 13: We traverse through the slice using the
for-rangeloop. Since we are not using the index, we place a_in that. -
Line 16: We add the present element to the
sum. -
Line 20: We display the
sumof the numbers in the slice.
