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nshannon-JavaScript

Beginning JavaScript Vocabulary

TermDefinition
Array literals lists values in a pair of square brackets
Accessing array elements You can get elements our of arrays if you know their index. The array's index starts at 0 and goes by increments of 1
Multi-dimensional Arrays an array within another array
Array constructor creates an array using an array constructor
Accessing nested array elements similar to one dimension arrays. accessed by using [index][index].the number you use depends on how deep you want to go inside
Boolean literals syntax. True or false
Boolean logical operators runs many true or false statements to get positive or negative feedback to what is true
Comparison operators comparing two statements and seeing if they are equal, greater than, less than, or greater/less than or equal to
Note: uses any non-zero #s to be true. any zero # is false, non-empty string is true and an empty string is false
== vs. === == does just value checking and === does both value checking and type checking
Definition defining code so you can understand later what you did
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 which is useful for debugging
console.time starts a timer which can track how long an operation takes to happen
console.timeEnd stops the timer by calling console.time()
Function definition a JavaScript procedure, many statements that perform a task or calculate a value. function is enclosed in {}
Function calling calling a function like: greet("Anonymous");
Function hoisting Two ways of declaring function produce different results. By declaring a function you "hoist" it to the top of the call and makes it available before it is defined
If simply states if that condition is true, do this, else do something else or nothing
Else fallback to an if statement, only gets executed if the other statement did not
else if It will only run if its condition is true, and the previous statement's condition was false
For Loops used to repeat a certain code a specific amount of times
While Loops Used when you don't know how many times you will execute a code. Only runs if it is true
Do While Loops Used if you have to use a code at least once but you don't know how many times you will need to use it
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 this value: 3.14159265
sqrt returns the square root of a number
% (Modulus) returns 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
Prefix and Postfix increment/decrement operators Prefix increment: 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. Postfix increment: operators that first re
Object Literals used as a means of encapsulating data, enclosing it in a tidy package to minimize the use of global variables which can cause problems when combining code
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). SubClass.prototype = new SuperClass();
alert alert(message); he alert dialog should be used for messages which do not require any response on the part of the user, other than the acknowledgement of the message.
confirm confirm("message") //returns true if confirmed, false otherwise
prompt The prompt() displays a dialog with an optional message prompting the user to input some text prompt(message);
Concatenation string1 + string2
length string.length
toUpperCase, toLowerCase Changes the cases of all the alphabetical letters in the string.
trim() Removes whitespace from both ends of the stringstring.trim()
replace() Returns a string with the first match substring replaced with a new substring.
charAt() Returns the specified character from a string.string.charAt(index)
substring() Returns the sequence of characters between two indices within a string. string.substring(indexA[, indexB])
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. 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: 2015shannonn