JavaScript Tutorial - Strings in JavaScript

Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/11/strings-in-javascript.html Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. https://www.youtube.com/channel/UC7sEwIXM_YfAMyonQCrGfWA/?sub_confirmation=1 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.