DEV Community: Raisan JMR

some() in javascript

Raisan JMR — Fri, 17 Nov 2023 16:48:17 +0000

what is some() method in javascript with help of 2 example

EXAMPLE 1
we need to check if an array contain admin role, then only we need to give access to some resources in our application

simple stupid way is to use some() method in javascript

EXAMPLE 2

Here we have an array that has students' marks out of 20. and pass mark is 9, We need to check if all students have passed or not.if at least one student fails some() method returns false

EXAMPLE 3

consider we have an array of objects representing food items, and you want to check if at least one food item belong to a specific category such as 'Fruit'

❤️have a nice day❤️

What is JavaScript String charAt() and charCodeAt()

Raisan JMR — Tue, 08 Feb 2022 15:55:45 +0000

first lets see charAt() in javascript

it is simple

charAt() method returns the character at a specified index in
a string
The index of the first character is 0, the second 1, third 3
The index of the last character is string length - 1

now lets see what is charCodeAt() in javascript

charCodeAt() method returns Unicode of the the character at a
specified index in a string.
The index of the first character is 0, the second is 1, third 3
The index of the last character is string length - 1
both uppercase and lowercase characters has seperate unicode
values

Hope your dots connected!!!! : )

what is concat() in javascript

Raisan JMR — Sat, 05 Feb 2022 02:05:08 +0000

concat() is a method in used in javascript to concatinate two strings or two arrays.

it does not change the existing string/arrays
it returns a new string/array
it joins two or more strings/array

below is an example of string concatination

lets look at how we can use concat() method to join two arrays

What is JSON

Raisan JMR — Thu, 03 Feb 2022 12:35:31 +0000

JSON which is popularly known as javascript object notation, it is a text format used to transfer data from server to client in plain text format.

the format of json is similar to javascript objects.

here is how javascript object looks like:

next we are going to convert this person object to JSON using a method called JSON.parse()

the output looks like plain text. and that is called JSON data

{"firstName":"John","lastName":"Doe","age":17,"address":{"city":"abc city","street":"abc street"}}

to convert back this JSON data to string we should use a method called JSON.stringify() and pass person object to it

there is an amazing website called https://jsonlint.com/ to test our json code