Learning jQuery 3 - Fifth Edition

Adding multiple functions

If our plugin needs to provide more than one global function, we could declare them independently. Here, we'll revise our plugin, adding a function to compute the average of an array of numbers:

(($) => {  $.sum = array =>    array.reduce(      (result, item) =>        parseFloat($.trim(item)) + result,      0    );  $.average = array =>    Array.isArray(array) ?      $.sum(array) / array.length :      '';})(jQuery); 

Listing 8.4

For convenience and brevity, we're using the $.sum() plugin to assist us in returning the value for $.average(). To decrease the chance of errors, we also check the argument to make sure it is an array before computing the average.

Now that a second method is defined, we can call it in the same fashion:

$(() => { const $inventory ...