JavaScript Interview Question #41: Increasing MAX_SAFE_INTEGER
True or false? What appears in the console? . . . . . . . . . . . . . . . . . JavaScript uses the double precision floating point numbers even to represent integers....
JS Interview
Here you can check your JavaScript skills and make sure you鈥檙e ready for the technical interview. Each article has a colorful code snippet, a correct answer and a detailed explanation of the problem.
JS Interview #40: What is the type of `undefined` in JS?
What鈥檚 the output? . . . . . . . . . . . . . . . . . In JavaScript, the typeof operator always returns a string. So, even though typeof undefined evaluates to undefined, it鈥檚 a string and not the primitive undefined value....
JS Interview #39: How does `setTimeout` work inside the `for` loop?
What will be logged to the console? . . . . . . . . . . . . . . . . . Before we analyze the code snippet, let鈥檚 try to simplify it by removing the setTimeout....
JS Interview #38: Can you add multiple arrays in JavaScript?
Can you add multiple arrays in JavaScript? What鈥檚 the output? . . . . . . . . . . . . . . . . . . The function add(x, y, z) applies the + operator to the provided arguments....
JS Interview #37: What is the type of a single argument provided to the split function?
What鈥檚 the output? . . . . . . . . . . . . . . . . . . In this code snipped, all the arguments provided to the function split will be collected and placed in a single array args....
JS Interview #36: Can you add a new property to the JS array?
Does the new array property affect its length? Is such an assignment valid at all? . . . . . . . . . . . . . . ....
JS Interview #35: What is faster, zero timeout or immediate resolve?
What鈥檚 the order of the output? . . . . . . . . . . . . . . . . . Both setTimeout and Promise.resolve are asynchronous actions, which means that the inner console....
JS Interview #34: Different ways to get current date in JavaScript
How do you prefer to get the current date in JS? What will be logged to the console? . . . . . . . . . . . ....
JS Interview #33: Add two empty arrays and check the type
Array? Object? Undefined? What鈥檚 the output? . . . . . . . . . . . . . . . . . . In JavaScript, the + operator doesn鈥檛 do the concatenation of arrays....
JS Interview #32: 0.1 + 0.1 + 0.1 === 0.3
What will be logged to the console? . . . . . . . . . . . . . . . . . . At a first glance, the answer is true as 0....