add: 只出现一次的数字等

src/array/binary-search.js

@@ -0,0 +1,27 @@
+/**
+ * @param {number[]} nums
+ * @param {number} target
+ * @return {number}
+ */
+export const search = function (nums, target) {
+  if (!nums || nums.length === 0) return -1
+
+  let start = 0
+  let end = nums.length
+  while (start < end) {
+    const mid = Math.floor(start + (end - start) / 2)
+    if (target === nums[mid]) {
+      end = mid
+    } else if (target < nums[mid]) {
+      end = mid - 1
+    } else {
+      start = mid + 1
+    }
+  }
+
+  if (target === nums[start]) {
+    return start
+  }
+
+  return -1
+}