Hi,
I translate code.
sym.play(); ==> the current symbol is played.
sym.deleteSymbol(); ==> the current symbol is deleted.
As this means the current value, you’ve got your this. This is sym.
The equivalent of this is sym.
sym.$("this").hide(); ==> it means you want to hide a symbol.
sym.getSymbolElement().hide(); Current symbol is hidden.
You can use this when you browse an array, an object.