Types of Array methods:
1. shift()
This method removes the first element from an array
let movies = ["ironman", "superman", "spiderman"];
movies.shift();
console.log(movies);
output:
[ 'superman', 'spiderman' ]
ironman has been removed from the start
2. unshift()
This method adds one or more elements to the beginning of an array
let movies = ["ironman", "superman"];
movies.unshift("spiderman");
console.log(movies);
output:
[ 'spiderman', 'ironman', 'superman' ]
spiderman has been added to the start
3. pop()
This method removes the last element from an array
let movies = ["ironman", "superman", "spiderman"];
movies.pop();
console.log(movies);
output:
[ 'ironman', 'superman' ]
spiderman has been removed from the last
4. push()
This method adds elements to the end of the array
let movies = ["ironman", "superman"];
movies.push("spiderman");
console.log(movies);
output:
[ 'ironman', 'superman', 'spiderman' ]
spiderman has been added to the end
5. slice()
This method returns a new array containing a portion of the array on which it is implemented
syntax: slice(starting index, ending index)
It captures only the starting index but does not capture the ending index
let numbers = [1, 2, 4, 8, 10, 12, 14];
let num = numbers.slice(1, 5);
console.log(num);
output:
[ 2, 4, 8, 10 ]
6. splice()
It changes the original array by removing or replacing existing elements of an array
syntax: splice(starting index, number of items to be removed)
let numbers = [1, 2, 4, 6, 8, 10, 12, 14];
numbers.splice(0, 3);
console.log(numbers);
output:
[ 6, 8, 10, 12, 14 ]
1,2,4 has been removed from the original array
7. includes()
This method checks if an array contains a specified element or not
The output of includes method is boolean
let courses = ["html", "css", "javascript"];
console.log(courses.includes("html"));
console.log(courses.includes("python"));
true ---> since html is included in the array hence the output is true
false ---> since python is not included in the array hence the output is false
8. concat()
It merges two or more arrays together
let courses1 = ["html", "css", "javascript"];
let courses2 = ["python", "java", "c++"];
console.log(courses1.concat(courses2));
output:
[ 'html', 'css', 'javascript', 'python', 'java', 'c++' ]
9. reverse()
This method reverses an array
let order = ["one", "two", "three"];
console.log(order.reverse());
output:
[ 'three', 'two', 'one' ]
10. join()
It returns a new string by concatenating all of the elements in an array
let message = ["Learning", "takes", "time"];
console.log(message.join(" "));
output:
learning takes time
11. indexof()
It returns the index number of an array
Index starts form 0
let myName = ["Sam", "Jack", "Micky", "Tom"];
console.log(myName.indexOf("Micky"));
output:
2
12. sort() and tostring()
sort() method sorts the items of an array in a specific order and tostring() method changes the array into normal text
let alphabet = ["d", "a", "b", "c"];
console.log(alphabet.sort());
console.log(alphabet.toString());
output:
[ 'a', 'b', 'c', 'd' ]
a,b,c,d