JavaScript Basic
1. JavaScript array find() method
Const numbers = [9, 12, 16, 20, 7, 8, 17, 15]
how to get value like 16 in the array?
Example:
Const getOne = numbers.find( num => element > 15 );
Console.log(getOne)
You can get output 16
2. JavaScript array filter() method
Const fruits = [“banana”, “orange”, “apple”, “mango”, “jackfruit”, “Lemon”]
How to get specific fruits length in array using filter method?
Example:
Const fruitsLength = fruits.filter( fruit => fruit.length > 5 );
Console.log(fruitsLength)
Get output = (“banana”, “orange”, “jackfruit”)
3.Another filter() method
Const numbers = [3, 9, 5, 13, 18, 20, 7, 4]
There is 8 numbers in array. How to get valus in the array less than 9 removed.
Const filterd = numbers.filter(num => num > 9 );
Console.log(filterd)
You can get output = (13, 18, 20)
4. JavaScript push() method
How to add new elements in the array.
Simple example:
Const device = [“mobile”, “watch”, “television”, “laptop”]
Const newDeviceAdd = device.push(“bike”, “car”)
Console.log(newDeviceAdd)
//expected output = [“mobile”, “watch”, “television”, “laptop”, “bike”, “car”]
5.JavaScript pop() method
How to removes the last element in the array
Example:
Const car = [“role roys”, “ferari”, “tesla”, “audi”, “tata”]
Const removes = car.pop()
Console.log(removes)
Output = [“role roys”, “ferari”, “tesla”, “audi”]
5. JavaScript array.toString() method
toSrting() method using the specific array
example:
const elements = [ 3, “ab”, “avx”, 10, 332]
const underElements = elements.toString()
console.log(underElements)
output = [“3, ab, avx, 10, 332”]
6. JavaScript reduce() method
How to work reduce method work that example
Const numbers = [7, 8, 9, 10]
Const reducer = (accumulator, currentValue) => accumulator + currentValue;
Const addingNumber = numbers.reduce(reducer)
Console.log(addingNumber)
Output = 34
Also more than example:
Const addingNumberTwo = numbers.reduce(reducer, 6);
Console.log(addingNumbersTwo)
Output = 40
7. JavaScript slice() method
Slice() method is using for collect soecific array elements
Example:
Const friends = [“boni”, “hafijul”, “monir”, “areful”, “ripon”]
Const findFriends = friends.slice(3)
Console.log(findFriens)
Output result = [“aredul”, “ripon”]
Also more than example:
Const findFriends = friends.slice(2, 4)
Console.log(findsFriend)
Output result = [“monir”, “areful”, “ripon”]
8. JavaScript String
Simple string example:
Const text = “mehedihasanibnc”
Const textNumber = text.length
Console.log(textLength)
Output result = 14
9. JavaScript toUpperCase() Method
The toUpperCase() method are using in string text letter uppercase
Example:
const sentence = ‘I am the stude of programming hero’;
const uppercase = sentence.toUpperCase()
console.log(uppercase)
output result = “I Am The Student Of Programming Hero”
10. JavaScript toLowerCase() Method
The toUpperCase() method are using in string text letter uppercase
Example:
const sentence = ‘I AM THE STUDENT OF PROGRAMMING HER’;
const lowercase = sentence.toLowerCase()
console.log(lowercase)
output result = “‘i am the stude of programming hero’”
