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Beginning JavaScrypt Vocabulary

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. If you fill this array with another array you get a three-dimensional array and so on.
Array constructor You can also create an array using the Array constructor.
Accessing nested array elements Accessing multi dimensional array elements is quite similar to one-dimension arrays
Note An important thing to note here is that not only Boolean literals (true and false) assert truth or false , but there are some other ways too to derive true or false
== vs. === A simple explanation would be that == does just value checking ( no type checking ) , whereas , === does both value checking and type checking .
Code Comments Code comments are used for increasing the readability of the code.
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 A function is a JavaScript procedure—a set of
Functions A function is a JavaScript procedure—a set of statements that performs a task or calculates a value.
Function hoisting The two ways of declaring functions produce different results
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,
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 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
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.
prompt The prompt() displays a dialog with an optional message prompting the user to input some text.
Strings Strings are text. They are denoted by surrounding text with either single or double quotes.
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 The ternary operator is usually used as a shortcut for the if statement.
Created by: 2016mannk