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NWhiteJavascript

beginning java script vocab

TermDefinition
Array literals to list values in a pair of square brackets
accessing array elements finding array index's starting at 0 and increasing by one for each element
multi-dimensional array having an array within an array
array constructor
accessing nested array elements similar to accessing array elements just use index and the number of arrays deep you want to go
boolean literals true or false
boolean logical operators expression1 && expression2 //returns true if both the expressions evaluate to true
comparison operators == does just value checking ( no type checking ) , whereas , === does both value checking and type checking . Seeing the examples may make it all clear. It is always advisable that you never use == , because == often produces unwanted results
code comments used to increase the readablility of code
single line comment Anything on the line following // will be a comment
multi line comment Anything between /* and */ will be a comment.
console.log prints text to the console
console.time starts a timer that lets you know how long an operation takes to happen.
console.timeEnd stops the console.time timer
function definition a javascript procedure (a set of statements that performs a task or calculates a value)
function calling greet("Anonymous");
function hoisting Declaring a function one way "hoists" it to the top of the call
if statement It simply states that if this condition is true , do this , else do something else ( or nothing )
else will only get executed if the "if statement" was false
else if It will only run if its condition is true, and the previous statement's condition was false
for loops looping a fixed number of times
while loop looping for an infinite number of times
do while loops if you have to loop at least once but unsure of how many times
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 interger less than or equal to a number
PI
sqrt returns the square root of a number
%modulus returns the remainder left when dividing the left side with the right side
isNaN returns true if the given number is not a number , else returns false
Basic Arithmic
Prefix and Postfix increment/decrement operators 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
Created by: 2014WhiteN