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kmann-Javascript
Beginning Javascript Vocabulary
| Term | Definition |
|---|---|
| Array literals | You can create arrays in two different ways. The most common of which is to list values in a pair of square brackets. JavaScript arrays can contain any types of values and they can be of mixed types. |
| Accessing array elements | You can get elements out of arrays if you know their index. |
| Multi-dimensional Arrays | A two-dimensional array is an array within an array. |
| 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 . They are accessed by using [index][index]..... (number of them depends upon the number of arrays deep you want to go inside). |
| 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.Have a look at the examples. |
| == vs. === | A simple explanation would be that == does just value checking ( no type checking ) , whereas , === does both value checking and type checking |
| Code Comments | ode 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.You give each timer a unique name, and may have up to 10,000 timers running on a given page. |
| console.timeEnd | Stops a timer that was previously started by calling console.time(). |
| Functions | A function is a JavaScript procedure—a set of statements that performs a task or calculates a value.It is like a reusable piece of code. |
| Function hoisting | The two ways of declaring functions produce different results. Declaring a function one way "hoists" it to the top of the call, and makes it available before it's actually defined. |
| 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, 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 | 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. |
| 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. 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. |
| 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. Characters in a string are indexed from left to right. |
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2106mannk
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