array: clean up filter()

vlib/builtin/array.v

@@ -269,7 +269,6 @@ pub fn (a []bool) str() string {
 			sb.write('true')
 		} else {
 			sb.write('false')
-			
 		}	
 		if i < a.len - 1 {
 			sb.write(', ')
@@ -350,33 +349,6 @@ pub fn (a []char) index(v char) int {
 	return -1
 }
 
-////////////// FILTER //////////////
-
-// Creates a new array with all elements that pass the test implemented by the provided function.
-pub fn (a  []string) filter2(predicate fn(p_val string, p_i int, p_arr []string) bool) []string
-{
-	mut res := []string
-	for i := 0; i < a.len; i++  {
-		if predicate(a[i], i, a) {
-			res << a[i]
-		}
-	}
-	return res
-}
-
-pub fn (a []int) filter2(predicate fn(p_val, p_i int, p_arr []int) bool) []int
-{
-	mut res := []int
-	for i := 0; i < a.len; i++  {
-		if predicate(a[i], i, a) {
-			res << a[i]
-		}
-	}
-	return res
-}
-
-////////////// REDUCE //////////////
-
 // Executes a reducer function (that you provide) on each element of the array,
 // resulting in a single output value.
 pub fn (a []int) reduce(iter fn (accum, curr int) int, accum_start int) int {

vlib/builtin/array_test.v

@@ -309,26 +309,6 @@ fn test_in() {
 	assert !(0 in a)
 }
 
-fn callback_1(val int, index int, arr []int) bool {
-	return val >= 2
-}
-
-fn callback_2(val string, index int, arr []string) bool {
-	return val.len >= 2
-}
-
-fn test_filter2() {
-	a := [1, 2, 3, 4, 5, 6]
-	b := a.filter2(callback_1)
-	assert b[0] == 2
-	assert b[1] == 3
-
-	c := ['v', 'is', 'awesome']
-	d := c.filter2(callback_2)
-	assert d[0] == 'is'
-	assert d[1] == 'awesome'
-}
-
 fn sum(prev int, curr int) int {
 	return prev + curr
 }
@@ -378,6 +358,12 @@ fn test_map() {
 	assert d[0] == 'V'
 	assert d[1] == 'IS'
 	assert d[2] == 'AWESOME'
+	bools := c.map(it == 'v')
+	assert bools.len == 3
+	assert bools[0] == true
+	assert bools[1] == false
+	assert bools[2] == false
+	
 }	
 
 fn test_array_str() {