diff --git a/binary-search/sol.go b/binary-search/sol.go
new file mode 100644
index 0000000..6e5fb72
--- /dev/null
+++ b/binary-search/sol.go
@@ -0,0 +1,22 @@
+package main
+
+// Time: O(log(n))
+// Space: O(1)
+func search(nums []int, target int) int {
+	move := 0
+	for l := len(nums); l > 1; l = len(nums) {
+		idx := l / 2
+		if nums[idx] < target {
+			nums = nums[idx+1:]
+			move += idx + 1
+		} else if nums[idx] > target {
+			nums = nums[:idx]
+		} else {
+			return move + idx
+		}
+	}
+	if len(nums) == 1 && nums[0] == target {
+		return move
+	}
+	return -1
+}