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jsullivan-JavaScript
Beginning JavaScript Vocabulary
| Term | Definition |
|---|---|
| Array literals | list of values in a pair of square brackets |
| Boolean literals | Boolean literals (true and false) assert truth or false |
| Code Comments | Used to describe lines of code and tell what they do so you don't forget after writing a lot |
| Console | Prints text to the console. Useful for debugging. |
| Functions | A function is a set of statements that performs a task or calculates a value |
| For Loop | A loop that occurs a set number of times |
| While loop | A loop that is used when a statement is true or false |
| Do While Loop | A loop that is done at least once, then turned into a while loop |
| Random | Returns a number between 0 and 1 |
| Floor | Returns the largest integer less than or equal to a number |
| Multi-dimensional Arrays | A two-dimensional array is an array within an array |
| Pow | Returns base raised to exponent |
| Ceil | Returns the smallest integer greater than or equal to a number |
| Pi | Returns the number Pi π |
| Sqrt | Returns the square root of a number |
| If statement | If the condition is true, do this. If not, do something else |
| Else statement | A fallback to an if statement. This will only get executed if the previous statement did not. |
| Else If statement | 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. |
| console.log | Prints text to the console |
| 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() |
| Accessing array elements | Getting elements out of their arrays by using their index |
| Array constructor | A tool to construct an array with |
| Accessing nested array elements | They are accessed by using [index][index] |
| Boolean logical operators | Runs true/false statements to try and derive an answer |
| Comparison operators | Compares values to get an answer as to what to do |
| Note: | not only Boolean literals (true and false) assert truth or false |
| == vs. === | == does just value checking ( no type checking ) , whereas , === does both value checking and type checking |
| 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 |
| Function calling | Executing a function |
| Function hoisting | Declaring a function one way "hoists" it to the top of the call, and makes it available before it's actually defined. |
| % (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 | Simple 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 |
| Object Literals | "property 1": value1, property2: value2, number: value3 |
| Property Access | name1[string] name2.identifier |
| Classes | A class can be thought of as a template to create many objects with similar qualities |
| alert | Display an alert dialog with the specified message and an OK button |
| confirm | returns true if confirmed, false otherwise |
| prompt | The prompt() displays a dialog with an optional message prompting the user to input some text. If the user clicks the "Cancel" button , null is returned. |
| Strings | Strings are text. They are denoted by surrounding text with either single or double quotes. |
| 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. |
| 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:
2016sullivanj
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