Archive for February, 2011

As sad as it is, this is the fifth and final installment in my series 5 Things Everyone Could Learn from The jQuery Source. Please feel free to comment!

5) Logical Looping

How many times have you seen or written the following code:

for (x=0;x<y.length;x++) {
    loopity(x);
}

We’ve all done it, it’s a sin we’ve all committed at one point or another. These loops are a hallmark of a sloppy code. Many people go on to that next level, and optimize this loop like this:

var l = y.length;
for ( x=0; x < l; x++) {
    loopity(x);
}

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This is the third post in the series 5 Things Everyone Could Learn from the jQuery Source:

3) Testing Type

As discussed above, making sure that the type of our objects is correct goes a long way towards building better code. Sometimes, we need to do a test to make sure that a variable is the correct type before we take an action on it. This could happen in cases where we don’t have full control over things like user input (and honestly, who DOES have full control over user input? Users don’t even have full control over what they input), or when a function may return different data types depending on the results of its internal processing. In a case like this, we need a reliable way to test what the type of our variables is. Although it happens in other places before this, I’m going to pick line 789 and the following code as my example:

if ( typeof key === "object" )

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