JavaScript from Null: Utility Functions and Debugging

Admin 2008-08-15 11:40:57

JavaScript University continues as we develop our first utility function that will allow us to filter and retrieve only the unique values from an array. Along the way, I'll also teach you how to use the excellent Firebug to debug your code.

Utility Functions and Debugging

Final Code from the Video:

var unique = function(origArr) {
    var newArr = [],
        origLen = origArr.length,
        found,
        x, y;
        
    for ( x = 0; x < origLen; x++ ) {
        found = undefined;
        for ( y = 0; y < newArr.length; y++ ) {
            if ( origArr[x] === newArr[y] ) { 
              found = true;
              break;
            }
        }
        if ( !found) newArr.push( origArr[x] );    
    }
   return newArr;
};

// Test it out
var myarray = ['jeffrey', 'allie', 'patty', 'damon', 'zach', 'jeffrey', 'allie'];
myarray = unique(myarray);
console.log(myarray); // jeffrey, allie, patty, damon, zach