Initial commit

Author: aswinkarthik

.gitignore

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+### Go ###
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+### Go Patch ###
+/vendor/
+/Godeps/
+
+
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+.idea
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+

README.md

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+# Godash
+
+Inspired from [Lodash](https://github.com/lodash/lodash) for golang
+
+# Functions
+
+## Map
+
+Map applies a mapper function on each element of an input and sets it in output. 
+
+_Primitive types_
+
+```go
+func main() {
+	input := []int{1, 2, 3, 4, 5}
+	output := make([]int, 0)
+
+	_ = godash.Map(input, &output, func(el int) int {
+		return el * el
+	})
+
+	fmt.Println(output) // prints 1 4 9 16 25
+}
+```
+
+_Struct type_
+
+```go
+type Person struct {
+	Name string
+	Age Int
+}
+
+func main() {
+	input := []Person{
+		{Name: "John", Age: 22},
+		{Name: "Doe", Age: 23},
+	}
+	output := make([]string, 0)
+
+	_ = godash.Map(input, &output, func(person Person) string {
+		return person.Name
+	})
+
+	fmt.Println(output) // prints John Doe
+}
+```

go.mod

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+module github.com/thecasualcoder/godash
+
+go 1.13
+
+require github.com/stretchr/testify v1.4.0

go.sum

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+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

map.go

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+package godash
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// Map applies mapperFn on each item of in and puts it in out
+func Map(in, out, mapperFn interface{}) error {
+	mapper := reflect.ValueOf(mapperFn)
+	if mapper.Kind() != reflect.Func {
+		return fmt.Errorf("mapperFn has to be a function")
+	}
+	input := reflect.ValueOf(in)
+	output := reflect.ValueOf(out)
+	if !output.Elem().CanSet() {
+		return fmt.Errorf("cannot set out. Pass a reference to set output")
+	}
+
+	if input.Kind() == reflect.Slice {
+		result := reflect.MakeSlice(output.Elem().Type(), 0, input.Len())
+		for i := 0; i < input.Len(); i++ {
+			arg := input.Index(i)
+
+			returnValues := mapper.Call([]reflect.Value{arg})
+
+			result = reflect.Append(result, returnValues[0])
+		}
+		output.Elem().Set(result)
+
+		return nil
+	}
+	return fmt.Errorf("not implemented")
+}

map_test.go

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+package godash_test
+
+import (
+	"github.com/stretchr/testify/assert"
+	"github.com/thecasualcoder/godash"
+	"testing"
+)
+
+func TestMap(t *testing.T) {
+	t.Run("support primitive types", func(t *testing.T) {
+		in := []int{1, 2, 3}
+		out := make([]int, 0)
+
+		err := godash.Map(in, &out, func(element int) int {
+			return element * element
+		})
+
+		expected := []int{1, 4, 9}
+		assert.NoError(t, err)
+		assert.Equal(t, expected, out)
+	})
+
+	t.Run("support structs", func(t *testing.T) {
+		type person struct {
+			name string
+			age  int
+		}
+
+		in := []person{
+			{name: "john", age: 20},
+			{name: "doe", age: 23},
+		}
+		out := make([]string, 0)
+		expected := []string{"john", "doe"}
+
+		err := godash.Map(in, &out, func(p person) string {
+			return p.name
+		})
+
+		assert.NoError(t, err)
+		assert.Equal(t, expected, out)
+	})
+}