What is CORS?
- Cross-Origin Resource Sharing
- Allows restricted resources (e.g. fonts) on a web page to be requested from an outside domain.
- Allows scripts to interact more openly with content outside of the original domain, leading to better integration between web services.
- All of the above.
What is a static method?
- A function that exists on an instance, not a class.
- A method that only takes one argument.
- A function that exists on a class, not an instance.
- None of the above.
How is let different from var?
let is block scoped.let isn't hoisted.let can't be redeclared.- All of the above.
Which of the following methods can be used to organize/encapsulate code?
- The module pattern in ES5 or Module Import Export in ES6.
- An Immediately Invoked Function Expression.
- OO or Objects Linked to Other Objects
- All of the above.
What are higher order components in React?
- They're basically wrappers for other components.
- They take in another component as an argument.
- They're used to extend or modify the behavior of a wrapped component.
- All of the above.
How do objects inherit methods in JavaScript?
- With
Object.create or Object.setPrototypeOf. - With
class Sub extends Super in ES2015. - Using
Parent.prototype.method.call inside Child.prototype.method. - All of the above.
What does the bind method do?
- Returns a function that, when executed, will call the original function with a
this context that you pass in. - Prevents the value of
this from being overridden by call or apply. - Allows you to implement partial application of a function.
- All of the above.
Which of these is a use case for the bind, call, or apply methods?
- You can use
call or apply to borrow methods from other objects. - You can use
bind for partial function application. - If you're using the
map method to run a function on an array and you need to preserve the this context, you can use bind. - All of the above.
What does the new keyword do?
- Creates a new empty object.
- Sets the prototype of the new object to the constructor's prototype and calls the constructor.
- Sets the
this variable to the new object and returns the new object. - All of the above.
What's an example of a practical use case for recursion?
- Traversing a tree (e.g., Walking the DOM).
- Flattening a deeply nested array.
- Deep freezing a deeply nested object.
- All of the above.
