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In the following code
var $next = $active.next().length ? $active.next()
: $('#slideshow IMG:first');
the part '$active.next().length' doesn't seem to compare anything and I don't understand how the condition is determined to be True or False.
Or is it saying that: if the various $next is equal to $active.next().length then the condition is true?
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Example 1: Equal to Operator== evaluates to true if the operands are equal. Note: In JavaScript, == is a comparison operator, whereas = is an assignment operator. If you mistakenly use = instead of == , you might get unwanted result.
It also appears not to be working based on: The context of usage. For example, you placed the condition statement under an event block. Though the syntax of the event block and the conditional statement might be right but if the event is not triggered, nothing will happen.
Javascript offers a ternary operator which acts like a one-line if / else statement with a single condition. It works really well for conditionally assigning a value to a variable.
In javascript any expression can be converted to a truthy or falsy value and hence is valid in a comparison place. The values which are false in javascript are
false0"" (empty string)nullundefinedNaNIn this case length refers to a numeric value and if it evaluates to 0 then it will be considered falsy. Otherwise it will be truthy
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If the length property is equal to 0 or undefined (i.e. $active is not an array), the condition will be false.
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