Week 2 Flashcards
Objects are ‘____’ - ‘____’ pairs
key-value
Write a for loop that counts to 50 by 5.
for (i = 0; i < 51; i += 5){
console.log(i)
}
What are the three parts needed for a for loop?
- ) Initialization
- ) Stopping condition
- ) Iteration statement
Write a for in loop that console logs each of the values in the following object.
let pet = {
name: "Finn",
breed: "Shiba Inu",
age: 2,
goodBoy: true
};let pet = {
name: "Finn",
breed: "Shiba Inu",
age: 2,
goodBoy: true
};
for (item in pet) {
console.log(pet[item])
}How do you invoke or call this function?
function hi( ) {
console.log('Hello')
}hi( )
Write and invoke a function that counts down from 10 to 0.
function countDown( ) {
for (i = 10; i >= 0; i--)
console.log(i)
}
countDown( )Write a for in loop that console logs each item in the following array. let seasons = ['spring', 'summer', 'autumn', 'winter'];
let seasons = ['spring', 'summer', 'autumn', 'winter'];
for (s in seasons){
console.log(seasons[s])
}Write a function that accepts the parameter food and console logs “My favorite food is …” using the parameter.
function favFood(food){
console.log(`My favorite food is ${food}.`)
}
favFood('sushi')Write a function that takes in the parameters crust, sauce, cheese, and topping to build a pizza. Have the function console log your pizza order.
function pizza(crust, sauce, cheese, topping){
console.log(`I would like a pizza with ${crust} crust, ${sauce}, ${cheese}, and ${topping}.`)
}
pizza('thin', 'marinara', 'mozarella', 'olives')What does the keyword “Return” do?
It brings data out of the function to make it accessible in a wider scope.
In the following for loop what is i = 1?
for (i = 1; i <= 10; i++) {
console.log(i)
}
The initialization
In this case it set the variable of i to 1 initially
In the following for loop what is i <= 10?
for (i = 1; i <= 10; i++) {
console.log(i)
}
The stopping condition
In this case the for loop will not stop until is is no longer less than or equal to 10
In the following for loop what is i++?
for (i = 1; i <= 10; i++) {
console.log(i)
}
The iteration statement
In this case it is saying that the variable i will be incremented by one each time to loop runs.
For the following array write a for of loop that console logs “Super Mario” before each of the items.
let games = [64, “Sunshine”, “Galaxy”, “Odyssey”];
let games = [64, “Sunshine”, “Galaxy”, “Odyssey”];
for (game of games) {
console.log(“Super Mario”, game)
}
What data type is the following: let colors = ['blue', 'green', 'purple']
Array
What data type is the following:
let colors = {'blue', 'green', 'purple'}Object
What will be console logged? let dogs = ['Husky', 'Shiba Inu', 'Beagle', 'Dalmatian'] console.log( dogs[1] )
Shiba Inu
What index number do arrays start at?
0
Which array method will append something to the end of an array?
.push( )
Example Usage:
let dogs = ['Husky', 'Shiba Inu', 'Beagle', 'Dalmatian'];
dogs.push('Golden Retriever');
Which array method can be used to cut something out of an array and add something else?
.splice( )
Example Usage: let dogs = ['Husky', 'Shiba Inu', 'Beagle', 'Dalmatian'] dogs.splice(0, 1, 'Corgi') //This will remove Husky and replace it with Corgi
The array method .splice( ) takes in three parameters. What is the purpose of each of these three parameters?
Array.splice(position, how many to cut, what to add in that location)
What array method can be used to remove the last element of an array?
.pop( )
Example Usage: let characters = ['Mario', 'Luigi', 'Yoshi', 'Peach'] characters.pop( ) //This will remove Peach
What array method can be used to remove the first item of an array?
. shift( )
Example Usage: let characters = ['Mario', 'Luigi', 'Yoshi', 'Peach'] characters.shift( ) //This will remove Mario
What will happen in the following code:
let characters = ['Mario', 'Luigi', 'Yoshi', 'Peach']
characters.unshift('Bowser', 'Wario')It will add Bowser and Wario to the beginning of the array
[‘Bowser’, ‘Wario’, ‘Mario’, ‘Luigi’, ‘Yoshi’, ‘Peach’]
What are the three arguments for a forEach( )
- ) currentValue = the current element being processed in the array
- ) index = the index of the current element being processed
- ) array = the array the forEach method was called upon
What is the syntax for a forEach( ) that will console log each of the items in this array? let characters = ['Mario', 'Luigi', 'Yoshi', 'Peach']
characters.forEach(c => { console.log(c); })
What will this console log?
let food = [‘Pizza’, ‘Pasta’, ‘Hamburger’, ‘Chips’, ‘Ice Cream’]
console.log(food.length)
5
How would you step through this object and console log ‘fire’?
let pokemon = {
name: 'Bulbasaur',
id: 1,
type: ['grass', 'poison'],
weakness: ['psychic', 'flying', 'fire', 'ice'],
evolvesTo: 'Ivysaur',
description: 'A strange seed was planted on its back at birth. The plant sprouts and grows with this Pokémon.'
}
console.log(pokemon.weakness[2])
What does JSON stand for?
JavaScript Object Notation
