Basics

Question 1

What is console?

Answer 1

Refers to an object, a collection of data and actions in JS.

Math is an object in js

Question 2

What is .log?

Answer 2

Tells console to log or print whatever is in parenthesis.

Ex) console.log(10)

Question 3

What is //?

Answer 3

Allows comments in code. Can be used in same line of code.

Question 4

What is /* */

Answer 4

Allows comment to use multiple code lines. Can be used within (inline) as a comment without affecting code.

Question 5

What are “Primitive” data types in JS?

Answer 5

#Number; 
'String'; 
Boolean (true or false);
null (intentional no value);
undefined (no data/type);

Question 6

What are arithmetic data types?

Answer 6

\+addition;
-subtraction;
*multiplication;
/division;
%modulus;

Question 7

What is ; ?

Answer 7

Like in CSS, ; is used to note the end of a statement

Question 8

What is string concatenation?

Answer 8

Use the + between strings to bring the strings together. Use ‘ ‘ for space between words.
Ex)
console.log(‘wo’ + ‘ah’); // Prints ‘woah’
console.log(‘I love to ‘ + ‘code.’)
// Prints ‘I love to code.’

Question 9

What is .length?

Answer 9

.length is an operator: can be used to tell how many characters are in a string
Ex) console.log(‘Teaching the world how to code’.length)
console: 30

Question 10

What are methods?

Answer 10

methods are actions we can perform in JS.
1) a period (the dot operator)
2) the name of the method
3) opening and closing parentheses
Note:
When we use console.log() we’re calling the .log() method on the console object.
Ex) console.log(‘Codecademy’.toUpperCase()); will print out: CODEACADEMY

Question 11

What does this statement say: console.log(Math.floor(Math.random() * 50));

Answer 11

// Prints a random whole number between 0 and 50

Question 12

What is the . (dot)?

Answer 12

signals the property of an object. Used to initiate a method in JS. Used with built-in objects like Number or Math