what does ?. sytax means in javascript code example
Example: JavaScript Syntax
var x, y, z; // Declare Variables
x = 5; y = 6; // Assign Values
z = x + y; // Compute Values
var x;
x = 6;var x, y, z; // Declare Variables
x = 5; y = 6; // Assign Values
z = x + y; // Compute Values
var x;
x = 6;