JavaScript from Null: Utility Functions and Debugging

 Topic: JavaScript Difficulty: Basix Format: 24 Minute Video

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.

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 outvar myarray = ['jeffrey', 'allie', 'patty', 'damon', 'zach', 'jeffrey', 'allie'];myarray = unique(myarray);console.log(myarray); // jeffrey, allie, patty, damon, zach

So, with this lesson out of the way, you now know how to build your own helpful utility functions. I hope you enjoyed today's video tutorial!

View the original article here