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What is the meaning of this construction:
If (YES) {
//some code
}
I found some examples of this kind of usage and I really don’t understand what is the meaning of this if (YES).
It doesn’t do anything per-se. It’s probably a relic left over from when there was a condition in that place. When debugging it could be quicker to convert an expression to YES than to remove the if statement altogether. Alternatively the programmer could be experimenting toggling a particular block of code by manually switching between YES and NO while running tests.