39 lines
774 B
Go
39 lines
774 B
Go
package main
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import "fmt"
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// range iterates over elements in a variety of data structures
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func main() {
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// use range to sum the numbers in a slice
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nums := []int{2, 3, 4}
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sum := 0
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for _, num := range nums {
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sum += num
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}
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fmt.Println("sum:", sum)
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// range on arrays and slices provides both the index and value for each entry
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for i, num := range nums {
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if num == 3 {
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fmt.Println("index:", i)
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}
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}
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// range on map iterates over key/value pairs
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kvs := map[string]string{"a": "apple", "b": "banana"}
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for k, v := range kvs {
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fmt.Printf("%s -> %s\n", k, v)
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}
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// range iterate over keys of a map
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for k := range kvs {
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fmt.Println("key:", k)
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}
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// range on strings iterates over Unicode code points
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for i, c := range "go" {
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fmt.Println(i, c)
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}
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}
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