qr code scanner java download JavaScript: A Beginner s Guide in Java

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JavaScript: A Beginner s Guide
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Finding the Last Character with the length Property If you want to find the last character, either you need to know how many characters are in the string before you use the method, or you can use the length property to determine the number of characters in the string When using the length property, remember that it returns the number of characters, not the position of the last character The length property begins counting at 1, while you must begin counting at 0 using the charAt() method Thus, the last character in a string will be at a position one less than the number of characters it contains In other words, if the string has 10 characters (1 10), the last position (0 9) is at 9 If the string has 23 characters (1 23), the last position (0 22) is at 23 1=22 Look at an example of this to see how it works The code finds the last character in a string:
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Subtract 1 from the length property to find the last position available in the string
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var the_text = "Character"; The charAt() method uses that var position = the_textlength-1; value to find out which character var last_char = the_textcharAt(position); is in the last position in the string windowalert("The last character is "+last_char);
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This code assigns the value of the length of the string minus1 to a variable named position The position variable now holds the position of the last character in the string The result of calling the charAt() method with the value of position sent as the parameter is assigned to a variable named last_char Finally, an alert provides the last character in the string, which is r Thus, the viewer gets an alert saying The last character is r
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The charCodeAt() Method
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The charCodeAt() method works the same way as the charAt() method, but it returns the character code for the character at the positions sent as the parameter The character code is a numeric code that can be substituted for characters in HTML In HTML, you can write an angle bracket (<) to show code on a Web page without the angle bracket converting to HTML itself by using a special character code In place of a regular angle bracket, for example, you could use < The charCodeAt() method returns the numeric part of that code, the 60 The charCodeAt() method can be useful if you want to find out the character code for a certain character This script allows you to do this:
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The charCodeAt() method finds the character code for the character at position 0 (the first character) in the string
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var the_text = "Hello"; var char_code = the_textcharCodeAt(0); windowalert("The character code is &#"+char_code+";");
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An alert would then tell you the character code at position 0 in the string (the letter H), which is 72 The alert will add the string &# on the front and the string ; to the back end of the character code for you and say The character code is H
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13: Handling Strings
The concat() Method
This method works much like the Array object s concat() method It combines the text string that calls the method with any number of other text strings sent as parameters and returns the combined value The text string calling the method comes first in the order, while the strings sent as parameters are added in order after it The following code shows an example that combines three strings using the concat() method:
var string1 = "I went to the store "; var string2 = "then "; var string3 = "I played a video game"; windowalert(string1concat(string2,string3));
The three strings are combined in order from left to right
This code combines the strings in the order string1, string2, and then string3 The result is an alert that says I went to the store then I played a video game If you want it in a different order, you can adjust which string calls the method and the order of the parameters, as this code shows:
var string1 = "I went to the store "; var string2 = " then "; var string3 = "I played a video game"; windowalert(string3concat(string2,string1));
The three strings are combined in order from left to right (again)
This time, string3 calls the method, so it comes first in the new string The values of string2 and string3 are added in order after that The result in this case is an alert that says I played a video game then I went to the store
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