I guess sometimes it just doesn't feel like working : )))

I run this script on different periods in MT5.

void OnStart()
  {
   printf(_Period);
  }

It showed a very intuitive result:

String Trim

void OnStart()
  {
   string hello = "   Hello   ";
   printf(StringTrimLeft(hello));
  }

MQL4

MQL5

This example returns bool that is always false or true !?!?

Thank god they don't write medical equipment software in that language! ))))
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Whoever says PHP sucks I got to show them this topic... PHP is super-awesome compared to this