Beginning JavaScript Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| array literals | list values in a pair of square brackets
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| 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
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| Multi-dimensional Arrays | A two-dimensional array is an array within an array.
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| Array constructor | a way of creating an array
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| Accessing nested array elements | Accessing multi dimensional array elements is quite similar to one-dimension arrays . They are accessed by using [index][index]
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| boolean literal | syntax, true or false
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| Boolean logical operators | syntax
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| Comparison operators | syntax, true or false
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| == vs. === | == does just value checking and === does both value checking and type checking
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| code comments | Comments are like notes , suggestions , warnings ,etc. that you can put for yourself. Code comments are not executed
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| Single Line Comment | Anything on the line following // will be a comment while anything before will still be code
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| Multi-Line Comment | Anything between /* and */ will be a comment.
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| console.log | Prints text to the console. Useful for debugging.
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| console.time | This function starts a timer which is useful for tracking how long an operation takes to happen.
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| console.timeEnd | Stops a timer that was previously started by calling console.time().
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| Function | a set of statements that performs a task or calculates a value.
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| Function hoisting | Declaring a function one way "hoists" it to the top of the call, and makes it available before it's actually defined.
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| if | if this condition is true , do this , else do something else ( or nothing ) .
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| else | A fallback to an if statement. This will only get executed if the previous statement did not.
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| else if | It will only run if its condition is true, and the previous statement's condition was false.
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| for loops | You use for loops, if you know how often you'll loop.
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| while loops | You use while loops, if you don't know how often you'll loop.
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| do while loops | You use do while loops, if you have to loop at least once, but if you don't know how often.
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| random | Returns a random number between 0 and 1
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| floor | Returns the largest integer less than or equal to a number
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| pow | Returns base raised to exponent
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| ceil | Returns the smallest integer greater than or equal to a number.
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| 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)
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| sqrt | Returns the square root of a number
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| % (Modulus) | it returns the remainder left after dividing the left hand side with the right hand side.
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| isNaN | Returns true if the given number is not a number , else returns false.
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| Basic Arithmetic | Doing basic arithmetic is simple.
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| 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.
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| Object Literals | properties and values
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| Property Access | name1[string]
name2.identifier
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| OOP | object-oriented programming
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| classes | thought of as a template to create many objects with similar qualities.
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| alert | isplay an alert dialog with the specified message and an OK button
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| confirm | confirm("message") //returns true if confirmed, false otherwise
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| prompt | displays a dialog with an optional message prompting the user to input some text.
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| Concatenation | string1 + string2
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| length | Returns the length of the string.
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| toUpperCase, toLowerCase | Changes the cases of all the alphabetical letters in the string.
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| trim() | Removes whitespace from both ends of the string.
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| replace() | Returns a string with the first match substring replaced with a new substring.
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| charAt() | Returns the specified character from a string.
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| substring() | Returns the sequence of characters between two indices within a string
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| 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
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| 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.
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| Ternary Operator | he ternary operator is usually used as a shortcut for the if statement.
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| Variable Assignment | var name = value;
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| Variable changing | varname = newValue
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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