Debugging

Great playground in chrome console

Most common errors

1. Thinking the value is invalid when it is actually undefined

2. Not awaiting for a promise

3. Can't do await in map/filter ft

4. Equality and booleans are jank in js

   1. [] !== [] | Boolean([]) === true

5. Problems with variable hoisting(using value before its defined, without throwing error)

Console

console.log( { x }); //{ } prints it as a dict so you get the variable name
console.table([1, 2]); // log in table 
console.trace('hi'): //will do stack trace

//Can compute performace
console.time("looper");
//some op
console.timeEnd("looper"); //=> looper: 4.3ms

Is something you are requiring undefined?

• Circular dependency, module.exports will just return null