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In this video we will discuss different functions that are available to manipulate string in JavaScript.
A string is any text inside quotes. You can use either single or double quotes.
var string1 = “string in double quotes”
var string2 = ‘string in single quotes’
Concatenating strings : There are 2 options to concatenate strings in JavaScript. You could either use + operator or concat() method
Example : Concatenating strings using + operator
var string1 = “Hello”
var string2 = “JavaScript”
var result = string1 + ” ” + string2;
alert(result);
Output : Hello JavaScript
Example : Concatenating strings using concat() method
var string1 = “Hello”
var string2 = “JavaScript”
var result = string1.concat(” “, string2);
alert(result);
Output : Hello JavaScript
If you want single quotes inside a string, there are 2 options
Option 1 : Place your entire string in double quotes, and use single quotes inside the string wherever you need them.
Example :
var myString = “Welcome to ‘JavaScript’ Training”;
alert(myString);
Output : Welcome to ‘JavaScript’ Training
Option 2 : If you prefer to place your entire string in single quotes, then use escape sequence character with a single quote inside the string.
Example :
var myString = ‘Welcome to ‘JavaScript’ Training’;
alert(myString);
Output : Welcome to ‘JavaScript’ Training
Please Note : You can use the above 2 ways if you need double quotes inside a string
Converting a string to uppercase : Use toUpperCase() method
Example :
var upperCaseString = “JavaScript”;
alert(upperCaseString.toUpperCase());
Output : JAVASCRIPT
Converting a string to lowercase : Use toLowerCase() method
Example :
var lowerCaseString = “JavaScript”;
alert(lowerCaseString.toLowerCase());
Output : javascript
Length of string javascript : Use length property
Example : alert(“JavaScript”.length);
Output : 10
Example :
var myString = “Hello JavaScript”;
alert(myString.length);
Output : 16
Remove whitespace from both ends of a string : Use trim() method
Example :
var string1 = ” AB “;
var string2 = ” CD “;
var result = string1.trim() + string2.trim();
alert(result);
Output : ABCD
Replacing strings in javascript : Use replace() method. This method searches a given string for a specified value or a regular expression, replaces the specified values with the replacement values and returns a new string. This method does not change the original string.
Example : Replaces JavaScript with World
var myString = “Hello JavaScript”;
var result = myString.replace(“JavaScript”, “World”);
alert(result);
Output : Hello World
Example : Perform a case-sensitive global replacement. In this example, we are using a regular expression between the 2 forward slashes(//). The letter g after the forward slash specifies a global replacement. The match here is case sensitive. This means Blue(with capital B) is not replaced with green.
var myString = “A Blue bottle with a blue liquid is on a blue table”;
var result = myString.replace(/blue/g, “green”);
alert(result);
Output : A Blue bottle with a green liquid is on a green table
Example : Perform a case-insensitive global replacement. The letters gi after the forward slash indicates to do global case-insensitive replacement. Notice that the word Blue(with capital B) is also replaced with green.