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jsullivan-JavaScript

Beginning JavaScript Vocabulary

TermDefinition
Array literals list of values in a pair of square brackets
Boolean literals Boolean literals (true and false) assert truth or false
Code Comments Used to describe lines of code and tell what they do so you don't forget after writing a lot
Console Prints text to the console. Useful for debugging.
Functions A function is a set of statements that performs a task or calculates a value
For Loop A loop that occurs a set number of times
While loop A loop that is used when a statement is true or false
Do While Loop A loop that is done at least once, then turned into a while loop
Random Returns a number between 0 and 1
Floor Returns the largest integer less than or equal to a number
Multi-dimensional Arrays A two-dimensional array is an array within an array
Pow Returns base raised to exponent
Ceil Returns the smallest integer greater than or equal to a number
Pi Returns the number Pi π
Sqrt Returns the square root of a number
If statement If the condition is true, do this. If not, do something else
Else statement A fallback to an if statement. This will only get executed if the previous statement did not.
Else If statement This is like an else statement, but with its own condition. It will only run if its condition is true, and the previous statement's condition was false.
console.log Prints text to the console
console.time This function starts a timer which is useful for tracking how long an operation takes to happen
console.timeEnd Stops a timer that was previously started by calling console.time()
Accessing array elements Getting elements out of their arrays by using their index
Array constructor A tool to construct an array with
Accessing nested array elements They are accessed by using [index][index]
Boolean logical operators Runs true/false statements to try and derive an answer
Comparison operators Compares values to get an answer as to what to do
Note: not only Boolean literals (true and false) assert truth or false
== vs. === == does just value checking ( no type checking ) , whereas , === does both value checking and type checking
Single Line Comment Anything on the line following // will be a comment while anything before will still be code
Multi-Line Comment Anything between /* and */ will be a comment
Function calling Executing a function
Function hoisting Declaring a function one way "hoists" it to the top of the call, and makes it available before it's actually defined.
% (Modulus) it returns the remainder left after dividing the left hand side with the right hand side.
isNaN Returns true if the given number is not a number , else returns false.
Basic Arithmetic Simple math
Prefix and Postfix increment/decrement operators Prefix increment / decrement operators are operators that first increase the value of the variable by 1 (increment) or decrease the value of an expression / variable by 1 (decrement) and then return this incremented / decremented value
Object Literals "property 1": value1, property2: value2, number: value3
Property Access name1[string] name2.identifier
Classes A class can be thought of as a template to create many objects with similar qualities
alert Display an alert dialog with the specified message and an OK button
confirm returns true if confirmed, false otherwise
prompt The prompt() displays a dialog with an optional message prompting the user to input some text. If the user clicks the "Cancel" button , null is returned.
Strings Strings are text. They are denoted by surrounding text with either single or double quotes.
Concatenation string1 + string2
length Returns the length of the string
toUpperCase, toLowerCase Changes the cases of all the alphabetical letters in the string.
trim() Removes whitespace from both ends of the string.
replace() Returns a string with the first match substring replaced with a new substring.
charAt() Returns the specified character from a string
substring() Returns the sequence of characters between two indices within a string
indexOf() Returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex, Returns -1 if the value is not found.
switch Acts like a big if / else if / else chain.
Ternary Operator The ternary operator is usually used as a shortcut for the if statement.
Variable Assignment var name = value;
Variable changing varname = newValue
Created by: 2016sullivanj