feat: 完成手写filter函数

Author: coderwei99

面试常见的手写题/14-filter.js

@@ -0,0 +1,13 @@
+const arr = [1, 2, 3, 4, 5]
+
+Array.prototype._filter = function (fn) {
+  const newArr = []
+  for (let i = 0; i < this.length; i++) {
+    if (fn(this[i])) newArr.push(this[i])
+  }
+  return newArr
+}
+
+const newArr = arr._filter((item) => item > 2)
+
+console.log(newArr)