nshannon-JavaScript Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Term | Definition |
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
Popular Computers sets