Skip to main content

Use of Hashes.

Hashes are an advanced form of array. One of the limitations of an array is that the information contained within it can be difficult to get to. For example, imagine that you have a list of people and their ages.

The hash solves this problem very neatly by allowing us to access that @ages array not by an index, but by a scalar key. For example to use age of different people we can use thier names as key to define a hash.

%ages = ('Martin' => 28,
        'Sharon' => 35,
        'Rikke' => 29,);

print "Rikke is $ages{Rikke} years old\n";

This will produce following result
Rikke is 29 years old

Comments

Post a Comment

Popular posts from this blog

How to Use Chisanbop (Korean Finger Math) for Basic Addition and Counting | eHow.com

How to Use Chisanbop (Korean Finger Math) for Basic Addition and Counting eHow.com Difficulty: Easy Instructions Step 1 In Chisanbop you'll be using your two hands and ten fingers to represent numbers from 0 to 99. Start out with your hands out in front of you with closed fists. This represents 0. Each finger (not thumb) on your right hand represents 1. To represent 3, just press down three right hand fingers. Your right thumb represents 5. To represent 7, press down your right thumb and 2 right hand fingers. Think of your right hand as the ones or units place (column). Step 2 Your left hand represents the tens place (column). Each finger on your left hand is worth 10. For example, to represent 30, press down three left hand fingers. To represent 38, do the same, but also use your right hand to represent 8 as described above. Your left thumb represents 50. To represent 86, press down your left thumb and three left hand fingers for the 80, and your right thumb and one righ...
Post a Comment
Read more
Should we allow our staff to use social networking sites? Some people say they are dangerous but I can't see how. Can you explain the dangers? > EXPERT RESPONSE There's nothing wrong with using Facebook, other than the potential impact on working time, but that's not a security matter! The issue is in how your staff configures Facebook, and what information they place on it. A few tips to pass on to your staff: Don't allow anyone that isn't part of your network of 'friends' to see your profile. Don't allow non-friends to see your friends. Why? I could easily impersonate one of your friends, fake a new profile, and send you an invite. You accept, thinking a genuine friend has created a new profile, then I'm in your network of friends and can see your profile. Think about what information is in your profile. What would be useful in stealing your identity? Date of birth, address, email address, employer, interests. why does this type of information n...
2 comments
Read more

Creative commons

Few Terms related to CC  - Commons :  The Commons refers to resources that are collectively owned. [1] This can include everything from land to software. [2] The process by which the commons are transformed into private property is often termed enclosure . [source : wikipedia ] The public domain (public ownership of creative works) is an intellectual property designation for the range of content that is not owned or controlled by anyone. These materials are "public property", and available for anyone to use freely (the "right to copy" [1] ) for any purpose. The public domain is most often discussed in contrast to works whose use is restricted by copyright . Under modern law, most original works of art, literature, music, etc. are covered by copyright from the time of their creation for a limited period of time (which varies by country). When the copyright expires, the work enters the public domain. The public domain can be defined in contrast to several f...
Post a Comment
Read more