Revert "Update util find (#1205)" (fix #1286)

This reverts commit e556943cec8eb33881534f70c546a2f9e5321407.

src/util.js

@@ -7,15 +7,7 @@
  * @return {*}
  */
 export function find (list, f) {
-  const { length } = list
-  let index = 0
-  let value
-  while (++index < length) {
-    value = list[index]
-    if (f(value, index, list)) {
-      return value
-    }
-  }
+  return list.filter(f)[0]
 }
 
 /**