map Operations

Code

package main

import "fmt"

func main() {
    m := make(map[string]int)
    m["a"] = 1
    m["b"] = 2

    // Read (check existence)
    v, ok := m["a"]
    if ok {
        fmt.Println(v)
    }

    // Delete
    delete(m, "b")

    // Iterate
    for k, v := range m {
        fmt.Printf("%s=%d\n", k, v)
    }

    // Literal
    m2 := map[string][]int{
        "even": {2, 4, 6},
        "odd":  {1, 3, 5},
    }
    fmt.Println(m2)
}

Explanation

map is an unordered key-value pair; check key existence via the ok idiom.

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