Create Deletion_Ways_In_Array.js

Author: HarshAgarwal1102

Deletion_Ways_In_Array.js

@@ -0,0 +1,58 @@
+// Deletion ways in array
+
+var arr = [10,20,1,2,90,33, 88];
+undefined
+
+
+arr.pop();  // delete a element from the last
+88
+arr;
+(6) [10, 20, 1, 2, 90, 33]  // result
+
+
+arr.shift();  // delete a element from the starting
+10
+arr.splice(1, 1);  // From Index 1 delete only one element
+[1]
+arr;
+(4) [20, 2, 90, 33]   // result
+
+
+arr.length=0;  // this will remove all the elemets from the array as length is 0 now.
+0
+arr;
+[]
+
+
+var arr = [10,20,1,2,90,33, 88];
+undefined
+arr.length = 4;  // this will remove all the elemets from the array except staring given length.
+4
+arr;
+(4) [10, 20, 1, 2]  // result
+
+
+var arr = [10,20,1,2,90,33, 88];
+undefined
+arr = arr.filter(e=>e<30);   // this will remove all the elements which are greater than 30. // DECLARATIVE PROGRAMING
+(4) [10, 20, 1, 2]
+arr;
+(4) [10, 20, 1, 2]
+
+
+var arr = [10,20,1,2,90,33, 88];
+undefined
+arr = arr.reduce((temp, e)=>{   // this will remove all the elements which are greater than 30. // IMPARATIVE PROGRAMING
+    if(e<30){
+        temp.push(e);
+    }
+    return temp;
+}, []);
+(4) [10, 20, 1, 2]
+arr;
+(4) [10, 20, 1, 2]
+
+arr[0] = 10000;   // Updation in array
+10000
+arr;
+(4) [10000, 20, 1, 2]