linkosmos / mapop

Golang map[string]interface{} operations: Keys, Values, Reject, Select, Split, MapKeys, MapValues, Partition, etc..

mapop

Regular map[string]interface{} operations. Ruby enumerable inspired package.

Methods

• Keys(input map[string]interface{}) (keys []string)
• Reject(input map[string]interface{}, keys ...string) map[string]interface{}
• Select(input map[string]interface{}, keys ...string) map[string]interface{}
• Split(input map[string]interface{}) (keys []string, values []interface{})
• Values(input map[string]interface{}) (values []interface{})
• MapKeys(f func(string) string, input map[string]interface{}) (output map[string]interface{})
• MapValues(f func(interface{}) interface{}, input map[string]interface{}) (output map[string]interface{})
• Partition(f func(string, interface{}) bool, input map[string]interface{}) (partition []map[string]interface{})
• Map(f func(key string, value interface{}) (string, interface{}), input map[string]interface{}) (output map[string]interface{})
• Collect(input map[string]interface{}) (output map[string]interface{})
• Merge(maps ...map[string]interface{}) (output map[string]interface{})
• SelectFunc(f func(key string, value interface{}) bool, input map[string]interface{}) (output map[string]interface{})

Usage

    input :=  map[string]interface{}{
      "Key1": 2,
      "key3": nil,
      "val": 2,
      "val2": "str",
      "val3": 4,
    }

Keys

  keys := mapop.Keys(input)

  > keys["Key1", "key3", "val", "val2", "val3"]

Reject

  input = mapop.Reject(input, "val", "val2", "val3")

  > input{"Key1": 2, "key3": nil}

Select

  input = mapop.Select(input, "val", "val2", "val3")

  > input{"val": 2, "val2": "str", "val3": 4}

Split

  keys, values := mapop.Split(input, "val", "val2", "val3")

  > keys["Key1", "key3", "val", "val2", "val3"]
  > values[2,nil,2,"str",4]

Values

  values := mapop.Values(input)

  > values[2,nil,2,"str",4]

MapKeys

  input = mapop.MapKeys(strins.ToUpper, input)

  > input{"KEY1": 2, "KEY3": nil, "VAL": 2, "VAL2": "str", "VAL3": 4}

MapValues

  input = mapop.MapValues(func(val interface{}) interface{} {
      return "-10"
  }, input)

  > input{"Key1": -10, "key3": -10, "val": -10, "val2": -10, "val3": -10}

Partition

  partitioned := mapop.Partition(func(key string, value interface{}) bool {
    return strings.Contains(key, "val")
  }, input)

  > partitioned[0]{"Key1": 2, "key3": nil}
  > partitioned[1]{"val": 2, "val2": "str", "val3": 4}

Map

  input = mapop.Map(func(key string, value interface{}) (string, interface{}) {
    if strings.Contains(key, "val") {
      return key, key
    } else {
      return key, value
    }
  }, input)

  > input{"Key1": 2, "key3": nil, "val": "val", "val2": "val2", "val3": "val3"}

Collect

  input = mapop.Collect(input)

  > input{"Key1": 2, "val": 2, "val2": "str", "val3": 4}

Merge

  input2 := map[string]interface{}{
    "a2": "str",
    "a3": 4,
  }

  input = mapop.Merge(input, input2)

  > input{"Key1": 2, "key3": nil, "val": 2, "val2": "str", "val3": 4, "a2": "str", "a3": 4}

SelectFunc

  input = mapop.SelectFunc(func(key string, value interface{}) bool {
    return key == "val"
  }, input)

  > input{"val": 2}

License

Copyright (c) 2015, linkosmos All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of mapop nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

mapop's Issues

How can I print key,value pair of map in function which accepts arguments in interface{}?

package main
import (
"fmt"
"reflect" )

func main() {
x := map[int]string{1:"anil",2:"xyz"}
find(x)
}
func find(x interface{}){
v := reflect.ValueOf(x)
//didn't get how to access keys of passed map x here..
}

The Merge function will not work properly if the map is nested

Try following case and it will fail

package main

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestMergeMap(t *testing.T) {
	t.Run("case1", func(t *testing.T) {
		m1 := map[string]interface{}{
			"a": "1",
		}
		m2 := map[string]interface{}{
			"b": "2",
		}
		got := MergeMap(m1, m2)
		expect := map[string]interface{}{
			"a": "1",
			"b": "2",
		}
		assert.Equal(t, expect, got)
	})
	t.Run("case2", func(t *testing.T) {
		m1 := map[string]interface{}{
			"a": "1",
		}
		m2 := map[string]interface{}{
			"b": map[string]interface{}{
				"c": "2"},
		}
		m3 := map[string]interface{}{
			"b": map[string]interface{}{
				"d": "3"},
		}
		got := MergeMap(m1, m2, m3)
		expect := map[string]interface{}{
			"a": "1",
			"b": map[string]interface{}{
				"c": "2",
				"d": "3",
			},
		}
		assert.Equal(t, expect, got)
	})
}

Good

Can I copy some func from your code?
golangframework/JSON