Section 1
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Code block or Block Statement
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Date created
Mar 1, 2020
Cards (76)
Section 1
(50 cards)
Code block or Block Statement
A code block is an instruction to the program. When a program runs, it goes through all of the code blocks you've set up and executes their instructions. A code block instructs the program to move whatever Actor's code that code block is in. A code block instructs the program to change the Background.
%
Arithmetic operator for remainder (division) in JavaScript
toUpperCase()
A String method that returns the String without any lower case letters.
console.log
JavaScript statement. Displays a string and/or variable values in the debug console in App Lab.
JavaScript Data Types
1. Number - Any number, including decimals 2. String - Any grouping of characters surrounded by quotes 3. Boolean - True or False 4. Null - Intentional absence of a value (keyword, no quotes) 5. Undefined - Different term for absence of a value (keyword, no quotes) 6. Symbol - Unique identifiers useful in complex coding. 7. Object - Collections of related data. More complex than the other six "primitive" types.
Parameters
Allow a function to accept inputs and perform a task using those inputs. function functionName(parameters){ }
Return
The functional keyword used to send a value back to a method's caller. It basically captures the result of a function so that it can be printed. SYNTAX return [value we want to return]
toLowerCase()
A String method that returns the String without any capital letters.
JavaScript
One of the most commonly used scripting language for use in web pages. Creates the logic that defines the behavior of webpages.
Arguments
The values that a program provides to a function.
var
Defines a variable in JavaScript.
HTTPS
Hypertext Transfer Protocol Secure Enables the secure transmission of data through servers identified as secure due to a certificate from a certificate authority.
Calling a function
function-identifier(); Actually runs the function in code
ternary operator
variable ? true : false; An alternate syntax for if/else conditional statements.
Template literals
' ${placeholder variable}' Syntax used for string concatenations
*
Arithmetic Operator for multiplication in JavaScript
Console
Panel that displays important messages, like errors, for developers. In JavaScript, the console keyword refers to an object—a collection of data and actions.
typeof
Returns the type of a variable
camel casing
A style in which an identifier begins with a lowercase letter and subsequent words within the identifier are capitalized. Use in JavaScript.
" + "
String concatenation in JavaScript. When + operator is used with strings.
default parameters
This allows some parameters to be optional for the caller, must be last in the parameter list If the caller does use that argument slot, the parameter takes the value passed in by the caller (the normal way functions work) If the caller chooses not to fill that argument slot, the parameter takes its default value
Length (property)
Stores an integer that represents the number of characters contained in a string
if
Conditional keyword in JavaScript
// //
Beginning and ending of a single-line comment in JavaScript.
Arrow functions
Alternative syntax that is easier for writing functions. Instead of writing "function" you can simply list the arguments, follow them with a fat arrow => and then point to a block of code.
/ /
Beginning and ending of a multi-line comment in JavaScript.
-
Arithmetic Operator for subtraction in JavaScript
logical operators
&& and | | or ! not (also known as the bang operator) Can be used to evaluate if multiple criteria are true or false in a conditional statement. Adds an additional layer of logic to code.
short circuit evaluation
When a boolean expression is evaluated the evaluation starts at the left hand expression and proceeds to the right, stopping when it is no longer necessary to evaluate any further to determine the final outcome. Helps assign clear truthy and falsy designations.
=, +=, -=, *=, /=, %=
Mathematical (re)assignment operators in JavaScript.
else if statement
The most general way of writing a multi-way decision. 1. The expressions are evaluated in order. 2. If any expression is true, the block associated with it is executed and this terminates the whole chain. It's like nesting IF functions in Excel "else if" always follows the initial "if" and ultimate "else" statements
HTTP
HyperText Transfer Protocol - the protocol used for transmitting web pages over the Internet
Property
JavaScript - an aspect of a datum (like length)
switch statement
allows multi-way branching. In many cases, using a switch statement can simplify a complex combination of if-else statements. Alternative syntax good for conditional statements with MANY options switch(var) { case 'case' : statement; break; case2... Default Switch statements should conclude with a default to catch everything else. Includes several different blocks of code, whereas if/else statements all occur in the same single block of code.
helper function
A design concept—basically a function inside another function as a matter of convenience.
const
JavaScript keyword that makes a variable unmodifiable. Must be assigned when declared and cannot be reassigned.
let
JavaScript keyword that allows a variable to be assigned a different value—or even an undefined value.
falsy values
false null - no value provided at all 0 - self explanatory " " or ' ' - Empty strings undefined - when a declared variable lacks a value NaN - not a number Automatically run the "else" script in a conditional statement.
truthy values
all values other than the six falsy values; truthy values are treated in comparison operation as the Boolean value true.
function expression
1 var bindingName = function actualName () { 2 //... 3 }; Invoking the function expression entails stating the variable followed by any arguments from the function expression. A function that is often stored inside a variable to help with defining that variable in the first place.
++, - -
Increment operators in JavaScript. Increase or decrease variable value by 1.
Conditional statement
JavaScript that checks specific conditions and performs a task based on its review. Includes if, else if, else, and switch statements.
myName
Sets a variable's name in JavaScript
Else
Conditional keyword in JavaScript. MUST be used in conjunction with and following an "if" statement.
Variable
Container for a values or information in JavaScript. Examples: Username, account number. Basically they label and store data in memory. Rules Cannot start with numbers; are case sensitive; cannot be the same as keywords
Functional Declarations
Binds a function to a name in JavaScript.. it does not RUN the function; it merely defines it. Must include the "function" keyword SYNTAX function identifier () { block of statements; }
/
Arithmetic operator for division in JavaScript
+
Arithmetic operator for addition in JavaScript
Comparison Operator
Used to compare two values. The comparison operator can be used in a condition of an if statement or while loop to return to a Boolean value indicating whether a comparison is true. < less than > greater than <= less than or equal to >= greater than or equal to === is equal to !== is not equal to All comparison statements evaluate to either TRUE or FALSE
Methods
Actions performed in JavaScript. In console.log( ), log is the method performed on the object, console.
Section 2
(26 cards)