react basics coursera week 2 quiz answers
Knowledge check: Events and errors
1. When handling a click event in react, you should use the following attribute:
- Onclick
- onClick
- OnClick
- on-click
2. Inside a JSX element, you can assign a JSX expression to the onClick handler to handle a click in React.
- False
- True
3. You can place an opening and a closing parenthesis after the name of the event-handling function that you assign to the onClick attribute.
- True
- False
5. Choose the valid example of an onclick event handler.
- <button onClick={handleClick}>Click me</button>
- <button onclick={handleClick}>Click me</button>
- <button on-click=”handleClick”>Click me</button>
- <button onClick={handleClick()}>Click me</button>
Knowledge check: Dynamic events and how to handle them
6. What code should be added to the element button to make this code snippet valid?
function App() {
function handleClick() {
console.log("clicked")
}
return (
< div className="App">
< button >Click me< /button>
< /div>
);
}
- onClick={handleClick}
- onClick={handleClick()}
- click=handleClick
7. Imagine that you have a variable named userLoggedIn and it’s set to the boolean of true. How would you complete the below clickHandler function declaration to toggle the value of the userLoggedIn boolean?
function clickHandler() {
}
- userLoggedIn = true
- userLoggedIn = !userLoggedIn
- userLoggedIn = false
8. Is a click handler on its own enough to change the values of variables in your React apps?
- No
- Yes
Shuffle Q/A 1
9. What are the ways to write an event-handling function in React. Select all that apply.
- Using a separate function expression
- Using a separate function declaration
- With an inline, anonymous ES6 function (an arrow function)
- With an inline anonymous ES5 function
10. Choose the appropriate code on line 3 of the following component – to handle a click event.
function App() {
function () {
console.log("clicked")
}
return (
< div className="App">
< button onClick={handleClick}>Click me< /button>
< /div>
);
}
- function handleClick {
- function handleClick() {
- function HandleClick() {
