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Could someone tell me what this line of code does? &nbsp; What does the &quot;===&quot; operator do? &nbsp;What about the question mark? &nbsp;<br />
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&nbsp;.attr(direction === 'right' ? 'x2' : 'x1', x);
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Could someone tell me what this line of code does?   What does the "===" operator do?  What about the question mark?  


 .attr(direction === 'right' ? 'x2' : 'x1', x);

Help with Javascript syntax

An algorithm is a self-contained step-by-step set of operations to be performed. Algorithms exist that perform calculation, data processing, and automated reasoning. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input.

Algorithms

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.