A Depth introduction in JavaScript strings

JavaScript is a scripting, interpreted programming language used both on the client-side and server-side.
Brendan Eich Invented JavaScript 1995. Brenden Eich is a Netscape engineer. JavaScript programs add to web pages in the Netscape Navigator browser.

Fact : It’s originally name is LiveScript, but it was renamed JavaScript in a marketing decision, because at This time Java language was being heavily marketed and was gaining popularity.

JavaScript Fundamentals :
Variables, data types , Code Structure, Operators, Functions, Data types, Type conversion, Comparisons, Conditionals etc..

JavaScript Data Types :
1. Primitive Data Types (stack)

• String, number , Boolean , null, undefined, symbol (ES2015)

2. Reference Data Types (non-primitive data type) (Heap)

Object

• Function, Array, date, Regular expressions

Let’s Start With JavaScript String :

What is A String?
JavaScript string stores a series of characters like : “Programming Hero”.

A string can be any text inside double or single quotes or using the backtick character Like : `IPL Postponed due to Covid-19 pandemic`

Slice method

The slice() method is used to fetch the part of the string and returns the new string.
The method takes 2 parameters: start position, end position .

Example Of Slice Method

Note : JavaScript counts positions from zero.

Substr method

The substr() method return at the parts of a string, beginning at the character at the specified position, and returns the specified number of characters.

Example Of Substr Method

startsWith, endsWith Method

startsWith

• The startsWith() method determines whether a string begins with the characters of a specified string.
• Result Is : returns true if the string Starts with the characters, and Not Starts with the characters Then returns false.

endsWith

• The endsWith() method
  Checks whether a string ends with a specified string.
• Result Is : returns true if the string End’s with the specified characters, and Not End’s with this characters Then returns false.

Example Of startsWith, endsWith Method

Note: The startsWith() Or endsWith() method is case sensitive.

indexOf , lastIndexOf

indexOf

• The indexOf() method returns strings of the first positions strings of a specified value in a string.
• Return Value Is Number.
• If the value not find then returns -1

lastIndexOf

• The lastIndexOf() method returns strings of the end positions strings of a specified value in a string.
• Return Value Is Number.
• If the value not find then returns -1

Example Of Index And LastIndex Method

Replace Method

• Replaces A string with another string, and returns a new string without modifying the original string.

Example Of Replace Method

Note : Required Two Arguments Must Have Provided

charAt Method

• charAt() returns the character from the specified index.
• Characters in a string are indexed from left to right.
• The index of the first character is 0, and the index of the last character in a string

Example Of charAt Method

toUpperCase, toLowerCase Method

toUpperCase()

• toUppercase Method Converts a string to uppercase letters.

toLowerCase()

• Converts a string to lowercase letters.

Example toUpperCase, toLowerCase Method

Concat Method

• Join two strings
• The concat() method is used to join two and or more strings.
  It’s not change the previous strings.
• But returns a new string containing the text of the joined strings.

Example Concat Method

Trim Method

• Removes whitespace from both ends of a string

Example Trim Method

Note: The trim() method does not change the original string.

trimStart, trimEnd method

• The trimStart() method removes whitespace at The starting of a string.
• The trimEnd() method removes whitespace at The end of a string.

Example trimStart And End Method