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sharrison-JavaScript

Beginning JavaScript Vocabulary

TermDefinition
array literals list values in a pair of square brackets
Accessing array elements You can get elements out of arrays if you know their index. 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.
Array constructor a way of creating 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 literal syntax, true or false
Boolean logical operators syntax
Comparison operators syntax, true or false
== vs. === == does just value checking and === does both value checking and type checking
code comments 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 a set of statements that performs a task or calculates a value.
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 if this condition is true , do this , else do something else ( or nothing ) .
else A fallback to an if statement. This will only get executed if the previous statement did not.
else if 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.
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 (π)
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.
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.
Object Literals properties and values
Property Access name1[string] name2.identifier
OOP object-oriented programming
classes thought of as a template to create many objects with similar qualities.
alert isplay an alert dialog with the specified message and an OK button
confirm confirm("message") //returns true if confirmed, false otherwise
prompt displays a dialog with an optional message prompting the user to input some text.
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. Checks a value against a list of cases, and executes the first case that is true.
Ternary Operator he ternary operator is usually used as a shortcut for the if statement.
Variable Assignment var name = value;
Variable changing varname = newValue
Created by: 2014uvag