Which browser storage API allows key-value pairs that persist?
Answer
localStorage
80 Javascript Trivia Questions with Answers
80 public questions with answers, drawn from the well. How many can you answer?
What does [] + [] evaluate to in JavaScript?
Answer
empty string
Which array method adds an element to the beginning?
Answer
unshift()
What property holds the maximum safe integer in JavaScript?
Answer
Number.MAX_SAFE_INTEGER
Which method of a Promise handles rejection?
Answer
.catch()
What error type is thrown when accessing a property of undefined?
Answer
TypeError
What keyword is used to define a generator function in JavaScript?
Answer
function*
Which function converts a string to an integer in JavaScript?
Answer
parseInt()
Which method parses a JSON string into a JavaScript object?
Answer
JSON.parse()
Which browser first implemented JavaScript?
Answer
Netscape Navigator 2.0
In Node.js, which phase of the event loop processes I/O callbacks?
Answer
poll phase
What is the inheritance model used by JavaScript?
Answer
prototypal inheritance
What is the result of adding 0.1 and 0.2 in JavaScript?
Answer
0.30000000000000004
What compilation technique does the V8 engine use for frequently executed code?
Answer
just-in-time compilation
What is the official name of the JavaScript language standard?
Answer
ECMAScript
What method converts a string to all uppercase letters in JavaScript?
Answer
toUpperCase()
What is the JavaScript method to output a message to the web console?
Answer
console.log
In what year was JavaScript invented?
Answer
1995
Which company created JavaScript?
Answer
Netscape