Thread by @mujeeb0147

JavaScript String Methods and Properties.

A Mega 🧵.

1. What is a JavaScript String?
- JavaScript strings are for storing and manipulating text.
-A JavaScript string is zero or more characters written inside quotes.

➡️Example:-

2. JavaScript Methods and Properties.

2.1. String length

To find the length of a string, use the built-in length property:

Example:-

2.2. slice() :-

-slice() extracts a part of a string and returns the extracted part in a new string.

-The method takes 2 parameters: the start position, and the end position (end not included).

-JavaScript counts positions from zero.
First position is 0.
Second position is 1.

2.3. substring():-

substring() is similar to slice().

The difference is that substring() cannot accept negative indexes.

Example:

2.4. substr();
substr() is similar to slice().

The difference is that the second parameter specifies the length of the extracted part.

Example:

2.5. Replacing String Content;-
The replace() method replaces a specified value with another value in a string:

Example:-

-This method does not change the string it is called on.

-It returns a new string.

-It replaces only the first match

-it is case sensitive.

2.6. toLowerCase():-
A string is converted to lower case with toLowerCase().
Example:-

2.7. toUpperCase();-
A string is converted to Upper case with toUpperCase().
Example:-

2.8. concat();-
concat() joins two or more strings.
Example;-

2.9, String trim():-
The trim() method removes whitespace from both sides of a string:
Example:-

3. String Padding:-
ECMAScript 2017 added two String methods: padStart and padEnd to support padding at the beginning and at the end of a string.

10.1. padStart():-

This Method will start giving padding from the start.

10.2. padEnd():-
This Method will start giving padding from the End.
Example:-

4. Extracting String Characters
There are 3 methods for extracting string characters:

4.1. charAt(position):-

The charAt() method returns the character at a specified index (position) in a string:

Example:-

4.2. charCodeAt(position):-
String charCodeAt()
The charCodeAt() method returns the unicode of the character at a specified index in a string:

The method returns a UTF-16 code (an integer between 0 and 65535).

Example:-

4.3. Property access [ ]:-
ECMAScript 5 (2009) allows property access [ ] on strings:

Example:-

5. String Search Methods.

5.1. String indexOf()
The indexOf() method returns the index of (the position of) the first occurrence of a specified text in a string:

Example:-

5.2. lastIndexOf();-

The lastIndexOf() method returns the index of the last occurrence of a specified text in a string:

Example:-

5.3. search();-

The search() method searches a string for a specified value and returns the position of the match:

Example; -

The two methods, indexOf() and search(), are equal?
The two methods are NOT equal. These are the differences:

- The search() method cannot take a second start position argument.
- The indexOf() method cannot take powerful search values (regular expressions).

5.4. match():-
The match() method searches a string for a match against a regular expression, and returns the matches, as an Array object.

Example 1:-
NOTE:- Perform a global, case-insensitive search for "ain":

5.5. includes():-
The includes() method returns true if a string contains a specified value.

Example;-

5.6. startsWith():-
The startsWith() method returns true if a string begins with a specified value, otherwise false:

Example;-

5.7. endsWith()
The endsWith() method returns true if a string ends with a specified value, otherwise false:

Example;-

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