JavaScript revision

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Why do we need Computer Programming?
Computer Hardware needs Software to work, Programming is the way that Software is produced.
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What is Syntax in computer programming?
The rules and grammar of computer programming.
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What does the .length key word give us in JavaScript?
The number of characters in a word or sentence.
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Which Keyword defines a variable
var
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How would you use it to define a variable called Name?
var name
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What characters need to be typed at the front of a line of JavaScript, to make it into a comment?
//
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What does the computer do with a comment in a computer program?
It ignores it, it is there only for humans to read.
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What punctuation mark would be the correct one to put at the end of this line of code to ensure that it has the correct syntax? console.log("Good morning!")
a semicolon ;
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What will this line of code do? prompt("How old are you?")
It creates a pop up box that will ask the user to answer the question How old are you?
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What are the keywords that will make the computer print something out?
console.log(); or print();
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What is Binary?
It is the machine language that a computer uses.
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What are the only two characters in Binary?
0 and 1.
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What will be the result of this code? "Tomato".length * 3 ===
Tomato has 6 letters so it will calculate 6 * 3 = 18
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Why is a loop in a computer program useful?
It makes the computer repeat a task more than once.
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What syntax can be used to increase a number in a loop?
++ or +=
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What syntax can be used tp decrease in a loop?
-- or -=
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What will the following code do? for var(i=1; i
It will count from 1 to 20 going up in fours, e.g. 4,8,12,16,20.
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Look at this code if(result < 60) {console.log("Fail");} else {console.log("Pass");} if your result was 75?
It would print out the word Pass.
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Why is an array useful?
It allows us to store more than one variable in a program.
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What is indexing in an array?
It tells the array where to start.
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What will this line of JavaScript assign to the variable dog? var dog =["Poodle", "Beagle", "Labrador"]
The names Poodle, Beagle and Labrador.
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What will this line of code show on the screen? "Highams".substring(0,3)
Hig
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What JavaScript will calculate the volume of cube?
var cube = function(width, length, height) volume = width * length * height console.log("The area of the cube is " + volume + "Square Meters");
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How would you call a function volume, for a cube with height 20, width 20 and depth 20?
cube (20,20,20);
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What are variables?
Something that can be changed or measured, e.g. length.
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Name another computer programming language other than JavaScript.
Python, html.
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What does this operator mean? >
Greater than
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What does this operator mean?
Less than.
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What does this operator mean? ===
equal to.
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Other cards in this set

Card 2

Front

What is Syntax in computer programming?

Back

The rules and grammar of computer programming.

Card 3

Front

What does the .length key word give us in JavaScript?

Back

Preview of the front of card 3

Card 4

Front

Which Keyword defines a variable

Back

Preview of the front of card 4

Card 5

Front

How would you use it to define a variable called Name?

Back

Preview of the front of card 5
View more cards

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