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kmann-JavaScrypt
Beginning JavaScrypt Vocabulary
| Term | Definition |
|---|---|
| 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
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