JS Others

1. Ending Definitions with a Comma

• Trailing commas in object and array definition are legal in ECMAScript 5. (but IE 8 will crash?)
• JSON does not allow trailing commas.

person = {firstName:"John", lastName:"Doe", age:46,}
points = [40, 100, 1, 5, 25, 10,];

2. Debugging

1. all modern browsers have a built-in JavaScript debugger.
2. Setting Breakpoints - debugger:
   • The debugger keyword stops the execution of JavaScript, and calls (if available) the debugging function.
   • This has the same function as setting a breakpoint in the debugger.
   • If no debugging is available, the debugger statement has no effect.

var x = 10;
console.log(x);

debugger; // On Chrome, it will automatically launch "Source" in the debugger menu.

x = 55;
console.log(x);