The tooltip shows the syntax, arguments, and a brief explanation of the function (Tooltip for a JSL Function). The tip also appears in the script editor window status bar.
After running a script, you can also place the cursor over variable names to see their current value. To turn off variable tooltips, deselect Preferences > Script Editor > Show Variable Value Tips.
To turn off function tooltips, deselect Preferences > Script Editor > Show Operator Tips.
my_variable = 8;
my_variable = "eight";