update docs

difference_test.go

@@ -9,9 +9,9 @@ import (
 )
 
 func TestDifference(t *testing.T) {
-	a := []int{1, 3, 5, 6, 7, 9}
+	nums := []int{1, 3, 5, 6, 7, 9}
-	b := []int{9, 7, 5, 4}
+	reject := []int{9, 7, 5, 4}
 	want := []int{1, 3, 6}
 
-	assert.Equal(t, want, u.Difference(a, b))
+	assert.Equal(t, want, u.Difference(nums, reject))
 }

docs/content/collections/difference.md

@@ -0,0 +1,22 @@
+---
+title: "Difference"
+date: 2022-03-21T13:48:21-04:00
+---
+
+Returns a copy of the array with all instances of the values that are not present in the other arrays.
+
+```go
+package main
+
+import (
+	"fmt"
+	u "github.com/rjNemo/underscore"
+)
+
+func main() {
+	nums := []int{1, 3, 5, 6, 7, 9}
+	reject := []int{9, 7, 5, 4}
+	
+	fmt.Println(u.Difference(nums, reject)) // {1, 3, 6}
+}
+```