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sharrison-JavaScript
Beginning JavaScript Vocabulary
| Term | Definition |
|---|---|
| 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
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