beginning java script vocab
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 | to list values in a pair of square brackets
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| accessing array elements | finding array index's starting at 0 and increasing by one for each element
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| multi-dimensional array | having an array within an array
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| array constructor |
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| accessing nested array elements | similar to accessing array elements just use index and the number of arrays deep you want to go
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| boolean literals | true or false
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| boolean logical operators | expression1 && expression2 //returns true if both the expressions evaluate to true
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| comparison operators | == does just value checking ( no type checking ) , whereas , === does both value checking and type checking . Seeing the examples may make it all clear. It is always advisable that you never use == , because == often produces unwanted results
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| code comments | used to increase the readablility of code
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| single line comment | Anything on the line following // will be a comment
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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
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| console.time | starts a timer that lets you know how long an operation takes to happen.
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| console.timeEnd | stops the console.time timer
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| function definition | a javascript procedure (a set of statements that performs a task or calculates a value)
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| function calling | greet("Anonymous");
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| function hoisting | Declaring a function one way "hoists" it to the top of the call
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| if statement | It simply states that if this condition is true , do this , else do something else ( or nothing )
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| else | will only get executed if the "if statement" was false
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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 | looping a fixed number of times
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| while loop | looping for an infinite number of times
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| do while loops | if you have to loop at least once but unsure of how many times
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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 interger less than or equal to a number
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| PI |
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| sqrt | returns the square root of a number
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| %modulus | returns the remainder left when dividing the left side with the right side
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| isNaN | returns true if the given number is not a number , else returns false
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| Basic Arithmic |
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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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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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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.
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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Created by:
2014WhiteN
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