29. June 2013

True/False gotcha Python vs Ruby vs PowerShell vs NodeJS vs PHP

Evaluation of conditions is very important part programming. True is ture, false is false…

Or not? It might surprise you, but not all languages evaluate numbers, empty strings or empty arrays in the same way.

Let’s examine several technologies. Python, Ruby, PowerShell, NodeJS and PHP.

Here is small code written in Python:

def test(value):
    if value:
        print "True"
    else:
        print "False"

test(0)
test(1)
test("")
test([])
test({})

Here is similar code written in Ruby:

def test(value)
    if value
        print "True"
    else
        print "False"
    end
end

test(0)
test(1)
test("")
test([])
test({})

Let’s compare it to PowerShell:

Function Test($value) {
    if ($value) {
        Write-Host "True"
    } else {
        Write-Host "False"
    }
}

Test(0)
Test(1)
Test("")
Test(@())
Test(@{})

Same logic in JavaScript for NodeJS:

function test(value) {
    if (value) {
        console.log("True");
    } else {
        console.log("False");
    }
}

test(0);
test(1);
test("");
test([]);
test({});

Code in PHP:

<?php 
function test($value) {
    if ($value) {
        echo "True";
    } else {
        echo "False";
    }
}

test(0);
test(1);
test("");
test(array());
test(array());
?>

Results are little bit surprising:

 

Python Ruby PowerShell NodeJS PHP
0 False True False  False False
1 True True True True True
“” False True False False False
[] False True True  True False
{} False True True  True False

You can test code on-line in Cloud9 IDE except PowerShell example 😉

26. May 2013

Python virtualenv and PowerShell

It’s quite easy to set up virtual environment with isolated packages for Python in PowerShell.

Creating virtual environment is the same like in any other shell. Let’s call this environment pyenv:

pip install virtualenv
virtualenv pyenv

The last step is to activate this environment in PowerShell (watch dots and spaces):

. .\pyenv\Scripts\activate.ps1

You should see name of your virtual environment in command line. Virtual environment is active.

26. May 2013

Useful tips for PowerShell users

You can find my new powershell-examples project at GitHub.

I store there small code snippets and support tool which could be useful for day to day life with PowerShell 😉

11. May 2013

Edge – invoke PowerShell from NodeJS

Project Edge allows seamless integration of NodeJS and PowrShell.

Just install packages:

npm install edge
npm install edge-ps

Create NodeJS application which contains PowerShell code:

var edge = require('edge');

var hello = edge.func('ps', function () {/*
"PowerShell welcomes $inputFromJS on $(Get-Date)"
*/});

hello('Node.js', function (error, result) {
 if (error) throw error;
 console.log(result[0]);
});

Start application and you’ll get output

PowerShell welcomes Node.js on 05/11/2013 07:14:38

Project Edge also allows integration of NodeJS with other technologies (e.g. Python)

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