arraysPracticeSet.html

<script>
    / 1.
Combining 2 arrays
 let arr1 = [1,2,3,4,5];
 let arr2 = [6,7,8,9,10];
 let combinedArray = [...arr1,...arr2];
 console.log(combinedArray);

2.
reversing an Array 
 let arr1 = [1,2,3,4,5];
 let ans = arr1.reverse();
 console.log(ans);


3.
Finding out duplicate elements in an array
 let findingDarray = (array) =>{
     return array.filter((value,index)=>array.indexOf(value) !== index);
 }

 let arr1 =  [1, 2, 3, 4, 5, 2, 7, 8, 2, 10, 1,20,20,40,90,90];
 let ans = findingDarray(arr1);



4.
Splicing an Array
 let arr = ["apples","mangoes","grapes","tomatoes"];
 arr.splice(0,0,"litchi");
 console.log(arr[0]);


4.1
Splicing
 let arr = [1,2,3,4,5,6];
 let ans = arr.splice(0,1,0);
 console.log(ans);
This is an output based question the answer would be [1];



4.2
Splicing
 let arr2 = [7,8,9,10];
 arr2.splice(0,2,6);
 for(let i in arr2){
     console.log(arr2[i]);
 }




Slicing
5
 let str = "bbhargav";
 console.log(str.slice(1,8));


5.1
 let str1 = "DILLIROLEX";
 console.log(str1.slice(5,10));


5.2
 let str = "ANBUSANTHANAM";
 console.log(str.slice(4,13));



forEach 
6
 let arr = [1,2,3,4,5];
 arr.forEach((el)=>{
     console.log( el*el );
 });



6.1
 let arr1 = [6,7,8,9,10] ;
 arr1.forEach((el)=>{
     console.log(el>7);
 });
 output:
 false
 false
 true
 true
 true



6.2
 let arr1 = [6,7,8,9,10];
 arr1.forEach((el) => {
     console.log(el / 2);
 });
 output:
 3
 3.5
 4
 4.5
 5



6.3
 let array = [20,34,56,78,96];
 array.forEach((el)=>{
     console.log(el * el);
 });
 output:
 400
 1156
 3136
 6084
 9216



7
Map method
 let array = [20,34,56,78,96];
 array.map((val)=>{
     console.log(val > 40);
 });
 output:
 false
 false
 true
 true
 true


7.1
 let array = [20,34,56,78,96];
 array.map((el)=>{
     console.log(el / 2 );
 });
 output:
 10
 17
 28
 39
 48




8
Filter Method
 let array = [20,34,56,78,96];
 array.filter((el)=>{
     console.log(el > 50);
 });
 output:
 false
 false
 true
 true
 true



8.1
to get the values instead of booolean:-
 let array = [20,34,56,78,96];
 let result = array.filter((el)=>{
     return el > 50 ;
 });
 console.log(result);
 output:
 [ 56, 78, 96 ]



8.2
 let array = [20,34,56,78,96];
 let res = array.filter((el)=>{
     return el >= 30 ;
 });
 console.log(res);
 output:
 [ 34, 56, 78, 96 ]
</script>