Go/Maps - Revision history

Admin: /* Iteration */

2018-12-13T21:54:47Z

Iteration

← Older revision		Revision as of 21:54, 13 December 2018
Line 93:		Line 93:
	<pre>		<pre>
	for key, value := range m {		for key, value := range m {
	fmt.Println(~~"Key:",~~ key, "~~Value~~:", value)		fmt.Println(key, ":", value)
	}		}
	</pre>		</pre>

			===Sorted Ordered Iteration===

			Suppose you want to iterate over a map, but you want to do it in order of sorted keys. To do this, we can do the following:

			* Create an array of keys
			* Iterate over the map, adding each key to the array of keys
			* Sort the keys
			* Loop over the sorted keys, and access each value in the order of the specified keys

	==Implementation Details==		==Implementation Details==

2018-12-13T16:08:20Z

Implementation Details

← Older revision		Revision as of 16:08, 13 December 2018
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	hits := make(map[Key]int)		hits := make(map[Key]int)
	</pre>		</pre>

			Now you can access items via, for example, <code>hits[Key{"/home","au"}]</code>

	=Flags=		=Flags=

	{{GoFlag}}		{{GoFlag}}

2018-12-13T16:07:44Z

Iteration

@@ Line 95: / Line 95: @@
      fmt.Println("Key:", key, "Value:", value)
+}
 </pre>

2018-12-13T16:03:34Z

Initialization

← Older revision		Revision as of 16:03, 13 December 2018
Line 26:		Line 26:

	The make function allocates space in memory for the hash table. It returns a map value pointing to this location in memory. It is important to note that the actual implementation of a map is not specified by the language, so it depends on the implementation of the Go runtime being used.		The make function allocates space in memory for the hash table. It returns a map value pointing to this location in memory. It is important to note that the actual implementation of a map is not specified by the language, so it depends on the implementation of the Go runtime being used.

			To initialize with literal data, use brackets:

			<pre>
			commits := map[string]int{
			"asdf": 10,
			"qwerty": 20,
			}
			</pre>

			This also gives a shorter way of creating maps than the make function:

			<pre>
			commits := map[string]int{}
			</pre>

	==Working with maps==		==Working with maps==

2018-12-13T16:03:02Z

Working with maps

← Older revision		Revision as of 16:03, 13 December 2018
Line 46:		Line 46:
	j := m["root"]		j := m["root"]
	// j == 0		// j == 0
	~~</pre>~~

	~~To initialize with literal data, use brackets:~~

	~~<pre>~~
	~~commits := map[string]int{~~
	~~"asdf": 10,~~
	~~"qwerty": 20,~~
	}
	</pre>		</pre>

2018-12-13T16:02:22Z

Working with maps

2018-12-13T16:02:12Z

Working with maps

@@ Line 46: / Line 46: @@
 j := m["root"]
 // j == 0
 </pre>
@@ Line 70: / Line 79: @@
 <pre>
 _, ok := m["root"]
 </pre>

2018-12-13T15:59:44Z

Working with maps

@@ Line 56: / Line 56: @@
 // remove the specified key from the map
 delete(m, "route")
 </pre>

2018-12-13T15:40:32Z

Working with maps

2018-12-13T14:53:41Z

Working with maps