Thought Delimited

Usually, finding a particular value in a Javascript array requires looping through the array until you find the value you're looking for.

jQuery provides a utility function called inArray() that takes the value being sought and the array as parameters and returns the index value indicating where in the array the value is located (-1 is returned if the value is not found in the array):

var index= jQuery.inArray(theValue, theArray);

You can use this jQuery function in conjunction with the Javascript push() and slice() functions to easily add or remove a value from an array:

//If you're not using any other Javascript library that utilizes the $ sign, you can use the $ sign 
//instead of the jQuery namespace
var index= $.inArray(theValue, theArray);
if(index== -1)
   {
     //Value not found in the array.  Add to the end of the array with push();
     theArray.push(theValue);
   }
else
   {
     //Remove from the array using splice(). Splice takes the index value of where you want to start 
     //removing items from the array as the first parameter, and then the number of item you want 
     //to remove as the second parameter.
     theArray.splice(index,1);
   }