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bnorte-JavaScript

Beginning JavaScript Vocabulary

TermDefinition
Array Literals list values in a pair of square brackets
Accessing array elements numbers in array laterals,accessed with[index]
multi-dimensional arrays array within an array
Array Constructor allows you to add other properties to arrays
Accessing nested array elements similar to accessing in one dimensional arrays, except using multiple [index]
Boolean true false statement
Boolean logical operators ways to put a Boolean into code
comparison operators how to compare two things
code comments how to explain what functions do
single line comment one line of comment
multi line comment multiple lines of comment
console.log prints text to console useful for debugging
console.time allows you to track how long something takes
console.timeEnd stops timer
function groups code together for easier programming
function calling creating a function
function hoisting makes function available before needed
if statement if something is true, do this, if not, then do not do this
else statement fallback to any if statement
if/else statement will only run if previous statement was false and this one is true
for loop used if you know how many times you need to loop a function
while loop used if you don't know how long you need to loop a function
do while loop used if you know you need it at least once but not know how many times you need to
random RETURNS RANDOM NUMBER BETWEEN ONE AND ZERO
floor returns integer less than or equal to a number
pow returns base raised to exponent
ceil returns smallest integer less than of equal to a number
PI returns ratio of the circumference of a cirle to it's diameter
sqrt returns square root of a number
% returns remainder after left side is divided by right side
isNAN returns true if given number is not a number else return false
basic arithmetic 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. post fix= other
object literals objects
property access how to access things in code
classes organizing similar objects in code
alert alert dialogue with an OK button
confirm returns true if confirmed
prompt displays optional message
string combining two things in code
length returns length of string
toUpperCase/toLowerCase returns opposite font
trim deletes empty space of both ends of string
replace returns a string with the first match sub-string is replaced with a new string
charAT returns specific character from string
substring returns 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 big if/else statement
ternary operator The ternary operator is usually used as a shortcut for the if statement.
variable assignment assigning a variable
variable changing changing a variable
Created by: bnorte98