BIT116: Scripting Functions

Arrays – Patterns For Usage

Arrays – Patterns: 1 Item At A Time

Pattern: 1-at-a-time Some array problems can be solved by considering each item, one by one, without thinking about the rest of the array Examples: Print each item Find a particular item in the array (or determine that it's not present) For these we just need to use the 'iterate through the array pattern' Let's look at the 'Print each item' example (

Here's what the 'main' / on click handler looks like: function GetUserInput( ) { var numAsInput = $("#num1").val(); var num = Number( numAsInput ); if( isNaN(num) ) { $("#output").html( "Error! " + numAsInput + " is not a number!"); throw new Error(numAsInput + " is not a number!"); } return num; $(document).ready( function() { $("#functionDemo").click( function() { var num = GetUserInput(); var spaced = SpaceNumberOut(num); SetOutput( spaced ); }); Notice that each function has a single, well-defined purpose

Pattern: 1-at-a-time Some array problems can be solved by considering each item, one by one, without thinking about the rest of the array Examples: Print each item Find a particular item in the array (or determine that it's not present) Single-item pattern print each item Find a particular item EXERCISES print matching items?

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