Recipe 9.13 Reversing a String by Word or by Letter

9.13.1 Problem

You want to reverse a string either by word or by letter.

9.13.2 Solution

Use the split( ) method to create an array of the words/characters and use the reverse( ) and join( ) methods on that array.

9.13.3 Discussion

You can reverse a string by word or by character using the same process. The only difference is in the delimiter you use in the split( ) method and the joiner you use in the join( ) method. In either case, you should first split the string into an array using a space as the delimiter for words or the empty string as the delimiter for characters. Then call the reverse( ) method of the array, which reverses the order of the elements. Finally, use the join( ) method to reconstruct the string. When reversing by word, use a space as the joiner, and when reversing by character, use the empty string as the joiner.

myString = "hello dear reader"; // Split the string into an array of words. words = myString.split(" "); // Reverse the array. words.reverse(  ); // Join the elements of the array into a string using spaces. myStringRevByWord = words.join(" "); // Outputs: reader dear hello trace(myStringRevByWord); // Split the string into an array of characters. chars = myString.split(""); // Reverse the array elements. chars.reverse(  ); // Join the array elements into a string using the empty string. myStringRevByChar = chars.join(""); // Outputs: redaer raed olleh trace(myStringRevByChar);


ActionScript Cookbook
ActionScript 3.0 Cookbook: Solutions for Flash Platform and Flex Application Developers
ISBN: 0596526954
EAN: 2147483647
Year: 2005
Pages: 425

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