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Can you explain this method call syntax to me?

this.mainParticleSystem.Simulate(time, withChildren: false, restart: true);

Particularly I don't understand what withChildren: false parameters syntax means. Is it some kind of default value or something?

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These are Named Arguments.

They were introduced together with optional arguments in C# 4.0 (VS 2010). Apparently the goal was not so much to support people who forget the order of method parameters, but to allow calling methods with many parameters while specifying only a few of them

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