Create string split function

README.md

@@ -158,6 +158,10 @@ Accepts a time layout in golang [time format](http://golang.org/pkg/time/#pkg-co
 <br /><br />
 ###### strings
 
+**`$split(s string, separator string})`**
+<br />
+Return an array of strings. 
+<br /><br />
 **`$contains(s string, substr string)`**
 <br />
 see [strings.Contains](http://golang.org/pkg/strings/#Contains)
@@ -190,4 +194,4 @@ evaluates a variable of type interface{} with a *TokenTree generated from `Parse
 
 ### changes
 - **.0.1.1** addition of $bool, $~bool, $num, $str, $now, $fmtTime, $parseTime. Fix for non-alphanumeric characters in JSON keys. 
-- **.0.1.0** initial release
+- **.0.1.0** initial release

jee.go

@@ -754,6 +754,26 @@ var binaryFuncs = map[string]func(interface{}, interface{}) (interface{}, error)
 		}
 		return float64(t.UnixNano() / 1000 / 1000), nil
 	},
+	"$split": func(val interface{}, b interface{}) (interface{}, error) {
+		sa, ok := val.(string)
+		if !ok {
+			return nil, nil
+		}
+
+		sb, ok := b.(string)
+		if !ok {
+			return nil, nil
+		}
+
+		var list []interface{}
+		stringList := strings.Split(sa, sb)
+
+		for _ , k := range stringList {
+			list = append(list, k)
+		}
+
+		return list, nil
+	},
 	"$fmtTime": func(a interface{}, b interface{}) (interface{}, error) {
 		layout, ok := a.(string)
 		if !ok {
@@ -826,6 +846,9 @@ var binaryFuncs = map[string]func(interface{}, interface{}) (interface{}, error)
 		if !ok {
 			return nil, nil
 		}
+		if b == nil {
+			return false, nil
+		}
 
 		for _, e := range s {
 			switch c := e.(type) {

jee_test.go

@@ -403,6 +403,18 @@ var Tests = []Test{
 		exp:    `$has($keys(.), "arrayString")`,
 		result: `true`,
 	},
+	Test{
+		exp:    `$has($split("arrayString, arrayString2, arrayString3", ","), "arrayString")`,
+		result: `true`,
+	},
+	Test{
+		exp:    `$has($split("arrayString, arrayString2, arrayString3", ","), "nope")`,
+		result: `false`,
+	},
+	Test{
+		exp:    `$has($split("arrayString, arrayString2, arrayString3", ","), null)`,
+		result: `false`,
+	},
 	Test{
 		exp:    `$has($keys(.), "nope")`,
 		result: `false`,