Array methods
Here, we have some array methods such as ;
1.push(): Used to insert values into an existing array, though the value will be added at the end 9f the array.
let numbers = [1,2,3];
Console. log(numbers.push(4));
The output here would be: [1, 2, 3, 4]
2.slice(): Used to get a given range of values from an array at their specific indexes.
let numbers = [1,2,3,4,5];
Console. log(numbers.slice(1, 4));
The range here is from 1 to 4, thus the last value at index 4 is not going to be among the values in the output.
The output here would be;
[1, 2, 3]
3.splice(): Inserts values at specific indexes accordingly as aligned by the user.
Forexample;let fruits =['apple' ,'mango','orange','peer'];
fruits . splice(2,0,'pawpaw', 'strawberries');
console.log (fruits);
Here, the 2-From where i will start.This means at index 2, we insert the first value(pawpaw) into the array, then ,0-how many we shall replace or delete. Therefore,0 means after insertion at 2, we insert strawberries at index 0, hence remove 0 items next to pawpaw.
The output here would be;
['apple' ,'mango','pawpaw', 'strawberries','orange','peer']
Incase we used 1 instead of 0, we would remove orange hence output would be;
'apple','mango','pawpaw','strawberries','peer'];
4.concatenation(); This can be used to join or add 2 or more arrays to form a single array.
Forexample;
let arr1=[1,2,3,4];
let arr2=[5,6 ,7];
console.log (arr1.concat(arr2))
Output:[1,2,3,4,5,6,7]
Let arr3=[8,9]
Console.log (arr1.concat(arr2,arr3))
Output here would be:[1,2,3,4,5, 6, 7, 8, 9]
5.fill(): This helps us to add a value into the array in a given range.
let arr4 = [1,2,3,4];
arr4.fill('Anurag', 2, 4);
console.log(arr4);
Here Output would be: [1,'Anurag' 4]
6.shift(): This shifts the first item of an array and removes it.
Forexample;
let arr4 = [1,2,3,4];
arr4.shift();
console.log (arr4);
Output here would be: [2,3,4]
7.indexOf(): This helps us to find the index at which a specific value is.
Forexample;
let arr4 = [1,2,3,4];
console.log (arr4.indexOf(3));
Output here would be 2 as the value 3 is stored at index 2.
8.lastIndexOf(): This outputs the index of the last value in an array.
Forexample;
let arr4 = [1,2,3,4];
console.log (arr4.lastIndexOf());
9.include(): This method is used to determine whether it is true or false a particular value is stored at that specific index.
Forexample;
let arr4 = [1,2,3,4];
arr4.include(4,2);
Output here would be false since value 4 is not stored at index 2.
10.pop(): Used to remove a value from the end of the array.
Forexample;
let arr4 = [1,2,3,4];
arr4.pop();
console.log(arr4);
Output here would be; [1,2,3]
11.join(): You can use any string or anything to join or add the values in an array together.
Forexample;
let arr4 = [1,2,3];
console.log (arr4.join('and'));
Output here would be; 1 and 2 and 3.
13.unshift(): This adds elements to the beginning of an array and returns the new length of the array.
Author Of article : Byali Macqueline Read full article
