53 lines
971 B
Go
53 lines
971 B
Go
// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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)
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func main() {
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/*
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#1: Nil Map: Read-Only
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*/
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var dict map[string]string
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fmt.Printf("Zero-value of a map: %#v\n", dict)
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/*
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#5: You cannot assign to a nil map.
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*/
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// dict["up"] = "yukarı"
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// dict["down"] = "aşağı"
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/*
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#2: Map retrieval is O(1) — on average.
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*/
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key := "good"
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//
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// #4: you can use an uninitialized map without checking it is nil
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//
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// if dict != nil {
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value := dict[key]
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fmt.Printf("%q means %#v\n", key, value)
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// }
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/*
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#3: Cannot use non-comparable types as map key types
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*/
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// var broken map[[]int]int
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// var broken map[map[int]string]bool
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//
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// A map can only be compared to nil value
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// _ = dict == nil
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/*
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#1 Step 2
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*/
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fmt.Printf("The dictionary contains %d words.\n", len(dict))
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}
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