In order to calculate the increase we simply need to subtract the first number (18) from the second (22).

22 - 18 = 4

The difference is 4 – or in other words – this year it rained 4 more inches than last year. It’s important to always subtract the numbers in this order. If your second number is lower than the first, you will have a negative number, and you’ll be calculating percentage decrease instead of increase. Because the difference is positive we are calculating increase.

Finding the increase was easy. What we really want to know is the percentage change – that is what percentage of the original number is the difference. In the terms of our problem – last year it rained 18″ and we want to know what percentage of 18 is 4.

4 / 18 = 0.222

This will give us the decimal solution, but since we are calculating the percentage we will need to multiple the answer by 100:

0.222 x 100 = 22.2

So the solution is 22.2%. In the terms of our problem, this year there has been a 22.2% increase in rainfall compared to last year.

Create an “a” tag and set the href to the URL you want to parse:

var parser = document.createElement("a"); parser.href = "http::8000/interests?query=1#bottom";

Now use the parser object to get the URL parts:

parser.protocol; // =>"http:" parser.hostname; // => "howchoo.com" parser.port; // =>"8000" parser.pathname; // => "/interests" parser.search; // => "?query=1" parser.hash; // => "#bottom" parser.host; // => "howchoo.com:8000"

This article expands on this idea to provide a little more functionality.

According to the gnu.org bash reference regarding the PROMPT_COMMAND. If set, the value is interpreted as a command to execute before the printing of each primary prompt. One way to change your prompt on the fly is to simply set the value of PROMPT_COMMAND.

josephtyler@tylermbp[~] # PROMPT_COMMAND='PS1=# '

I’ve set two functions in my bashrc file to make this process easier. I’ve called the functions eep for expand prompt and ccp for contract prompt but you can call them whatever you’d like. Open your bashrc file to edit:

vim ~/.bashrc

Add the following at the end:

INITIAL_PROMPT_COMMAND=$PROMPT_COMMAND
function ccp() {
    PROMPT_COMMAND="PS1='# '"
}
function eep() {
    PROMPT_COMMAND=$INITIAL_PROMPT_COMMAND
}

The first line simply sets the initial command prompt to a new variable so that we can access it later.

INITIAL_PROMPT_COMMAND=$PROMPT_COMMAND

The next two lines are functions eep and ccp that you can use to expand and contract your bash prompt.

After saving this file, you’ll need to source it for it to take effect.

source ~/.bashrc