Work with a partner to implement the following user stories:
As a developer, I want to use array methods to add and remove elements from an array and join two arrays.
As a developer, I want to use a string method to return a new string that contains only capital letters.
It’s done when the string "Canis Major" is added as the first element of the constellations array and no elements are removed.
It’s done when "Venus" is removed from the planets array.
It’s done when the arrays constellations and planets are joined to form a new array named galaxy. The arrays constellations and planets should not be altered.
It’s done when the string "polaris" is converted into all capital letters and the new string is stored in a variable.
Refer to the documentation:
MDN Web Docs on array instance methods
MDN Web Docs on string instance methods
If you have completed this activity, work through the following challenge with your partner to further your knowledge:
typeof on an array? What is returned? Is that what you expected? Why or why not?Use Google or another search engine to research this.
var constellations = ["Orion", "Scorpius", "Lyra", "Ursa Major", "Ursa Minor"];
var planets = ["Earth", "Saturn", "Mars", "Jupiter", "Uranus", "Venus"];
var star = "polaris";
// The unshift method adds an element to the beginning of the array
constellations.unshift("Canis Major");
console.log(constellations);
// The pop method removes the last element in the array
planets.pop();
// The original array is changed
console.log(planets);
//The concat method joins constellations and planets array and returns new array
var galaxy = constellations.concat(planets);
//The galaxy and planet arrays are unchanged
console.log(planets);
console.log(constellations);
console.log(galaxy);
// The toUpperCase method makes all the letters in the string "polaris" capital letters
var upperCaseStar = star.toUpperCase();
console.log(upperCaseStar);
// The original string is unchanged
console.log(star);