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Beginning JavaScript Vocabulary

Array literals The most common of which is to list values in a pair of square brackets
Accessing array elements indexes start at 0 and increment by 1, so the first element's index is 0, the second element's index is 1, the third element's is 2, etc.
Multi-dimensional Arrays A two-dimensional array is an array within an array. If you fill this array with another array you get a three-dimensional array and so on.
Array constructor create an array
Accessing nested array elements Accessing multi dimensional array elements is quite similar to one-dimension arrays . They are accessed by using [index][index]
Boolean literals true or false syntax
Boolean logical operators expression1 && expression2 //returns true if both the expressions evaluate to true expression3 || expression4 // return true if either one of the expression evaluates to true
Comparison operators x === y // returns true if two things are equal x !== y // returns true if two things are not equal x <= y // returns true if x is less than or equal to y x >= y // returns true if x is greater than or equal to y x < y // returns true if x is less tha
note 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
Definition Comments are like notes , suggestions , warnings ,etc. that you can put for yourself. Code comments are not executed
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.
console.log Prints text to the console. Useful for debugging.
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()
Function definition To use a function, you must define it somewhere in the scope from which you wish to call it. A function definition (also called a function declaration) consists of the function keyword,
Function calling functionName(Argument1,2,...
Function hoisting Declaring a function one way "hoists" it to the top of the call, and makes it available before it's actually defined.
if It simply states that if this condition is true , do this , else do something else ( or nothing ) . It occurs in varied forms.
else A fallback to an if statement. This will only get executed if the previous statement did not.
else if 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.
For Loops You use for loops, if you know how often you'll loop. The most often used varName in loops is "i".
While Loops You use while loops, if you don't know how often you'll loop.
Do while loops You use do while loops, if you have to loop at least once, but if you don't know how often.
random Returns a random number between 0 and 1
floor Returns the largest integer less than or equal to a number.
pow Returns base raised to exponent.
ceil Returns the smallest integer greater than or equal to a number.
PI Returns the ratio of the circumference of a circle to its diameter, approximately 3.14159 or in better terms, the value of PI
sqrt Returns the square root of a number.
% (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 Doing basic arithmetic is simple. basic 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. Classes are a fundamental component of object-oriented programming (OOP).
Alert Display an alert dialog with the specified message and an OK button. Note: The alert dialog should be used for messages which do not require any response on the part of the user,
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. Characters in a string are indexed from left to right. The index of the first character is 0
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. The indexOf method is case sensitive.
switch Checks a value against a list of cases, and executes the first case that is true.
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: 2015crosbym