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LinkedIn JavaScript Assessment

LinkedIn Assessments - JavaScript 2019

Overview

Answer 15-20 timed, multiple-choice questions

• ~15 minutes duration
• 70th percentile required to pass and get a badge
• Retry in 3 months if you don’t pass

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You've written the event listener shown below for a form button, but each time you click the button, the page reloads. Which statement would stop this from happening?

button.addEventListener('click', function(e) {
  button.className = 'clicked';
}, false);

• e.preventDefault();

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Which statement references the DOM node created by the code shown?

 <p class="pull">Lorem Ipsum </p>

• document.querySelector(".pull");

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Which statement is the correct way to create a variable called rate and assign it the value 100?

• let rate = 100;

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When would the final statement in the code shown be logged to the console?

let modal = document.querySelector('#results');
setTimeout(function() {
  modal.classList.remove('hidden');
}, 10000);
console.log('Results shown');

• Immediately

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Which statement creates a new object using the Person constructor?

• var student = new Person();

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When would you use a conditional statement?

• When you want your code to choose between multiple options.

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How is forEach statement different from a for statement?

• A for statement is generic but a forEach statement can be used only with an array.

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Review the code below. Which statement calls the addTax function and passes 50 as the argument?

• addTax(50);

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What is the result in the console of running the code shown?

var Storm = function () {};
Storm.prototype.precip = 'rain';
var WinterStorm = function () {};
WinterStorm.prototype = new Storm();
WinterStorm.prototype.precip = 'snow';
var bob = new WinterStorm();
console.log(bob.precip);

• 'snow'

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How does a function create a closure?

• It returns a reference to a variable in its parent scope.

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What is the result in the console of running this code?

"use strict";
function logThis() {
  this.desc="logger";
  console.log(this);
}
new logThis();

• Function

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What is the result of running this statement?

console.log(typeof(42));

• 'Number'

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