Remove splitN() and splitAfterN()

builtin/builtin.go

@@ -164,30 +164,34 @@ var Builtins = []*Function{
 	{
 		Name: "split",
 		Func: func(args ...interface{}) (interface{}, error) {
-			return strings.Split(args[0].(string), args[1].(string)), nil
+			if len(args) == 2 {
+				return strings.Split(args[0].(string), args[1].(string)), nil
+			} else if len(args) == 3 {
+				return strings.SplitN(args[0].(string), args[1].(string), runtime.ToInt(args[2])), nil
+			} else {
+				return nil, fmt.Errorf("invalid number of arguments for split (expected 2 or 3, got %d)", len(args))
+			}
 		},
-		Types: types(strings.Split),
-	},
-	{
-		Name: "splitN",
-		Func: func(args ...interface{}) (interface{}, error) {
-			return strings.SplitN(args[0].(string), args[1].(string), runtime.ToInt(args[2])), nil
-		},
-		Types: types(strings.SplitN),
+		Types: types(
+			strings.Split,
+			strings.SplitN,
+		),
 	},
 	{
 		Name: "splitAfter",
 		Func: func(args ...interface{}) (interface{}, error) {
-			return strings.SplitAfter(args[0].(string), args[1].(string)), nil
+			if len(args) == 2 {
+				return strings.SplitAfter(args[0].(string), args[1].(string)), nil
+			} else if len(args) == 3 {
+				return strings.SplitAfterN(args[0].(string), args[1].(string), runtime.ToInt(args[2])), nil
+			} else {
+				return nil, fmt.Errorf("invalid number of arguments for splitAfter (expected 2 or 3, got %d)", len(args))
+			}
 		},
-		Types: types(strings.SplitAfter),
-	},
-	{
-		Name: "splitAfterN",
-		Func: func(args ...interface{}) (interface{}, error) {
-			return strings.SplitAfterN(args[0].(string), args[1].(string), runtime.ToInt(args[2])), nil
-		},
-		Types: types(strings.SplitAfterN),
+		Types: types(
+			strings.SplitAfter,
+			strings.SplitAfterN,
+		),
 	},
 	{
 		Name: "replace",

builtin/builtin_test.go

@@ -42,9 +42,9 @@ func TestBuiltin(t *testing.T) {
 		{`upper("foo")`, "FOO"},
 		{`lower("FOO")`, "foo"},
 		{`split("foo,bar,baz", ",")`, []string{"foo", "bar", "baz"}},
-		{`splitN("foo,bar,baz", ",", 2)`, []string{"foo", "bar,baz"}},
+		{`split("foo,bar,baz", ",", 2)`, []string{"foo", "bar,baz"}},
 		{`splitAfter("foo,bar,baz", ",")`, []string{"foo,", "bar,", "baz"}},
-		{`splitAfterN("foo,bar,baz", ",", 2)`, []string{"foo,", "bar,baz"}},
+		{`splitAfter("foo,bar,baz", ",", 2)`, []string{"foo,", "bar,baz"}},
 		{`replace("foo,bar,baz", ",", ";")`, "foo;bar;baz"},
 		{`replace("foo,bar,baz,goo", ",", ";", 2)`, "foo;bar;baz,goo"},
 		{`repeat("foo", 3)`, "foofoofoo"},

docs/Language-Definition.md

@@ -303,36 +303,22 @@ Converts all the characters in string `v` to lowercase.
 lower("HELLO") == "hello"
 ```
 
-### split(v, delimiter)
+### split(v, delimiter[, n])
 
 Splits the string `v` at each instance of the delimiter and returns an array of substrings.
 
 ```expr
 split("apple,orange,grape", ",") == ["apple", "orange", "grape"]
+split("apple,orange,grape", ",", 2) == ["apple", "orange,grape"]
 ```
 
-### splitN(v, delimiter, n)
-
-Splits the string `v` at each instance of the delimiter but limits the result to `n` substrings.
-
-```expr
-splitN("apple,orange,grape", ",", 2) == ["apple", "orange,grape"]
-```
-
-### splitAfter(v, delimiter)
+### splitAfter(v, delimiter[, n])
 
 Splits the string `v` after each instance of the delimiter.
 
 ```expr
 splitAfter("apple,orange,grape", ",") == ["apple,", "orange,", "grape"]
-```
-
-### splitAfterN(v, delimiter, n)
-
-Splits the string `v` after each instance of the delimiter but limits the result to `n` substrings.
-
-```expr
-splitAfterN("apple,orange,grape", ",", 2) == ["apple,", "orange,grape"]
+splitAfter("apple,orange,grape", ",", 2) == ["apple,", "orange,grape"]
 ```
 
 ### replace(v, old, new)
@@ -351,12 +337,14 @@ Repeats the string `v` `n` times.
 repeat("Hi", 3) == "HiHiHi"
 ```
 
-### join(v, delimiter)
+### join(v[, delimiter])
 
 Joins an array of strings `v` into a single string with the given delimiter.
+If no delimiter is given, an empty string is used.
 
 ```expr
 join(["apple", "orange", "grape"], ",") == "apple,orange,grape"
+join(["apple", "orange", "grape"]) == "appleorangegrape"
 ```
 
 ### indexOf(v, substring)
@@ -457,7 +445,7 @@ Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
 duration("1h").Seconds() == 3600
 ```
 
-### date(v[, format, timezone])
+### date(v[, format[, timezone]])
 
 Converts the given value `v` into a date representation.