Understanding Javascript - Object Creation vs Lookup

I have ANOTHER question about some javascript/jQuery code.

It's probably not necessary, but here's where the code is from.

Why does this line create a chart...

 $('#container-speed').highcharts(Highcharts.merge(gaugeOptions,...

And this one doesn't?

 var chart = $('#container-speed').highcharts();

Am I interpreting this correctly? If so, why? What are the rules?

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