Strings in JavaScript
Link for all dot net and sql server video tutorial playlists
/ kudvenkat
Link for slides, code samples and text version of the video
http://csharp-video-tutorials.blogspo...
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.
/ @aarvikitchen5572
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.
In questa pagina del sito puoi guardare il video online Strings in JavaScript della durata di ore minuti seconda in buona qualità , che l'utente ha caricato kudvenkat 05 novembre 2014, condividi il link con amici e conoscenti, su youtube questo video è già stato visto 125,978 volte e gli è piaciuto 433 spettatori. Buona visione!
