explain this expression

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// Force Until Velocity Reached
float threshold = 2.0; // Cut off
float speed = length(@v);

if (speed > threshold)
{
force = 0;
}

what is the name of this language?
please give a source to me that i learn this language?
it is very complex for me because i dont know any language basics
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this is VEX
http://www.sidefx.com/docs/houdini15.0/vex/_index [sidefx.com]
Michael Goldfarb | www.odforce.net
Training Lead
SideFX
www.sidefx.com
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