Term pt.1(intro)

Question 1

Console.log()

Answer 1

Method used to log or print messages to the console. It can also be used to print objects and other info.

Question 2

JavaScript

Answer 2

JavaScript is a programming language that powers the dynamic behavior on most websites. Alongside HTML and CSS, it is a core technology that makes the web run.

Question 3

Methods

Answer 3

Methods return information about an object, and are called by appending an instance with a period ( . ), the method name, and parentheses.

Question 4

Libraries

Answer 4

Libraries contain methods that can be called by appending the library name with a period ( . ), the method name and a set of parentheses.

Question 5

Numbers

Answer 5

Numbers are primitive data type. They include the set of all integers and floating point numbers.

Question 6

String.length

Answer 6

The (.length) property of a string returns the number of characters that make up the string.

Question 7

Data Instances

Answer 7

When a new piece of data is introduced into a JavaScript program, the program keeps track of it in an instance of that data type. An instance is an individual case of a data type.

Question 8

Booleans

Answer 8

Booleans are a primitive data type. They can be either “True” or “False”

Question 9

Math.random()

Answer 9

The Math.random() function returns a floating-point, random number in the range from 0 (inclusive) up to but not including 1.

Question 10

Math.floor()

Answer 10

The Math.floor() function returns the largest integer less than or equal to the given number.

Question 11

Single Line Comments

Answer 11

In JavaScript, single-line comments are created with two consecutive forward slashes ( // ).

Question 12

Null

Answer 12

Null is a primitive data type. It represents the intentional absence of value. In code, it is represented as null.

Question 13

Strings

Answer 13

Strings are a primitive data type. They are any grouping of characters (letters, spaces, numbers, or symbols) surrounded by single quotes ( ‘ ) or double quotes ( “ ).

Question 14

Aritmethic Operators

Answer 14

JavaScript supports arithmetic operators for: 
 ( +, - addition
 - , - subtraction
 * , - multiplication
 / , - division
 %  - modulo)

Question 15

Multi-line Comments

Answer 15

In JavaScript, multi-line comments are created by surrounding the lines with ( /* ) at the beginning and ( */ ) at the end. Comments are good ways for a variety of reasons like explaining a code block or indicating some hints, etc.

Question 16

Remainder/Modulo Operator(%)

Answer 16

The remainder operator, sometimes called modulo, returns the number that remains after the right-hand number divides into the left-hand numbers as many times as it evenly can.

Question 17

Assignment Operators

Answer 17

An assignment operator assigns a value to its left operand based on the value of its right operand. Here are some of them. 
\+= addition assignment
-= subtraction assignment
*= multiplication assignment
/= division assignment

Question 18

String Interpolation

Answer 18

String interpolation is the process of evaluating string literals containing one or more placeholders ( expressions, variables, etc ).

Question 19

Variables

Answer 19

Variables are used whenever there’s a need to store a piece of data. A variable contains data that can be used in the program elsewhere. Using variables also ensures code re-usability since it can be used to replace the same value in multiple places.

Question 20

Undefined

Answer 20

( undefined ) is a primitive JavaScript value that represents lack of defined value. Variables that are declared but not initialized to a value will have the value ( undefined ).

Question 21

let Keyword

Answer 21

( let ) creates a local variable in JavaScript & can be re-assigned. Initialization during the declaration of a ( let ) variable is optional. A ( let ) variable will contain ( undefined ) if nothing is assigned to it.

Question 22

const Keyword

Answer 22

A constant variable can be declared using the keyword ( const ). It must have an assignment. Any attempt of re-assigning a ( const ) variable will result in JavaScript runtime error.

Question 23

String Concatenation

Answer 23

In JavaScript, multiple strings can be concatenated together using the ( + ) operator. In the example, multiple strings and variables containing string values have been concatenated. After execution of the code block, the ( displayText ) variable will contain the concatenated string.

Question 24

Floating Point

Answer 24

Primitive data stored as decimal numbers. Decimal numbers are sometimes referred to as a floating point numbers or floats.

Question 25

camelCase

Answer 25

Multi-word variable names in JavaScript. That have the first word in lowercase and the first letter of each subsequent word Capitalized.