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polyfills/filter.js

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+ console.log("Polyfill of Filter");
+
+ //Always return a new array.
+
+ // Logic of for loop
+
+ // Always check for condition.
+
+ let arr = [2,4,6,8];
+
+ let arr2 = arr.filter((val)=> val < 5);
+
+ console.log(arr);
+ console.log(arr2);
+
+ Array.prototype.filter = null; /// for disable filter method
+
+
+ /////---- POlifill of filter ---///
+
+Array.prototype.myFilter = function (callback) {
+  let newArray = [];
+
+  for (let i = 0; i < this.length; i++) {
+    if (callback(this[i], i , this)) {
+        newArray.push(this[i])      
+    }
+  }
+  return newArray;
+}
+let arr3 = arr.myFilter((val, index, array) => val <= 6);
+
+console.log(arr)
+console.log(arr3)