Zoic JS methods

Question 1

Array.reduce()

Answer 1

Must create a callback function to use with it. Is able to reduce an array of numbers based on the callback function used with it. (previousValue and currentValue)

Question 2

String.includes()

Answer 2

Checks whether one string is found in the string it’s called on. Returns true or false.

Question 3

Array.entries()

Answer 3

Returns a new array iterator that contains a key/value pair for each index of the array.

Question 4

Object.keys()

Answer 4

Method that returns an array of the object.

Question 5

Array.forEach()

Answer 5

Method that executes a provided function once for each array element.
array.forEach(element => console.log(element))

Question 6

Object.assign()

Answer 6

Method that copies all properties from one or more source objects and modifies the target object. Returns the modified target object.

Question 7

Array.from()

Answer 7

Method that creates a new array instance of the array or string.

Question 8

Array.reverse()

Answer 8

Method that reverses an array. The first array element becomes the last, the last array element becomes the first.

Question 9

Array.join()

Answer 9

Method that creates and returns a new string by concatenating all of the elements in an array. join() or join(separator)

Question 10

Document.createElement

Answer 10

Method that creates the HTML element by tagName.
let element = document.createElement(tagName)

Question 11

Node.textContent

Answer 11

document.getElementById(tagName).textContent = ‘text’

Question 12

element.appendChild()

Answer 12

Allows an element to be appended to a parent element.

element.appendChild(child element)

Question 13

HTMLElement.style

Answer 13

Returns the inline style of the element in the form of a CSS Style Declaration object.
style = element.style

Question 14

HTML DOM changing CSS

Answer 14

document.getElementById(id).style.color = “blue”