At this point in the course we discuss math in JavaScript � how we can use operators and other features to successfully manipulate numbers to do our bidding. Okay, maybe not. Some of us like math, some of us have hated math ever since we had to learn multiplication tables and long division in school, and some of us sit somewhere in between the two.
But none of us can deny that math is a fundamental part of life that we can't get very far. This is especially true when we are learning to program JavaScript or any other language for that matter � so much of what we do relies on processing numerical data, calculating new values, and so on, that you won't be surprised to learn that JavaScript has a full-featured set of math functions available.
In programming, even the humble decimal number system that we all know so well is more complicated than you might think. We use different terms to describe different types of decimal numbers, for example:. We even have different types of number systems! Decimal is base 10 meaning it uses 0�9 in each columnbut we also have things like:. Before you start to get worried about your brain melting, stop right there! For a start, we are just going to stick to decimal numbers throughout this course; you'll rarely come across a need to start thinking about other types, if.
The second bit of good news is that unlike some other programming languages, JavaScript only has one data type for Byjus App 8th Class Maths Java numbers, both integers and decimals � you guessed it, Number. This means that whatever type of numbers you are dealing with in JavaScript, you handle them in exactly the same way. Byjus app 8th class maths javascript for the purposes of byjus app 8th class maths javascript course, we'll just worry about Number values. Let's quickly play with some numbers to reacquaint ourselves with the basic syntax we need.
Enter the commands listed below into your developer tools JavaScript console. The Number object, an instance of which represents all standard numbers you'll use in your JavaScript, has a number of byjus app 8th class maths javascript methods available on it for you to manipulate numbers.
We don't cover these in detail in this article because we wanted to keep it as a simple introduction and only cover the real basic essentials for now; however, once you've read through this module a couple of times it is Lorem lpsum 342 boatplans/pontoon-boats/cbse-10th-standard-science-syllabus-res read more going to the object reference pages and learning more about what's available.
For example, to round your number to a fixed number of decimal places, use the toFixed method. Type the following lines into your browser's console :. Sometimes you might end up with a number that is stored as a string type, which makes it difficult to perform calculations with it. This most commonly happens when data is entered into a form input, and the input type is text.
There is a way to solve this problem � passing the string value into the Number constructor to return a number version of the same value. You end up with the resultnot 77, because myNumber is actually defined as a string. You can test this by typing in the following:. Returns the remainder left over after you've divided the left number into a number of integer portions equal to the right number. Note : You'll sometimes see byjus app 8th class maths javascript involved in arithmetic referred to as operands.
Note : You may sometimes see exponents expressed using the older Math. For example, in Math. We probably don't need to teach you how to do basic math, but we would like to test your understanding of the syntax involved.
Try entering the examples below into your developer tools Byjus app 8th class maths javascript console to familiarize yourself with the syntax. Some of this last set of calculations might not give you quite the result you were expecting; the section below might well give the answer as to why.
Let's look at the last example from above, assuming that num2 holds the value 50 and num1 holds the value 10 as originally stated above :. As a human being, you may read this as "50 plus 10 equals byjus app 8th class maths javascript Lorem lpsum 342 boatplans/online/top-vintage-bookshelf-speakers-zoom top vintage bookshelf speakers zoom, then "8 plus 2 equals 10"and finally "60 divided by 10 equals 6".
But the browser does "10 divided by 8 equals 1. This is because of operator precedence � some operators are applied before others when calculating the result of a calculation referred to as an expressionin programming. Operator precedence byjus app 8th class maths javascript JavaScript is the same as is taught in math classes in school � Multiply and divide are always Byjus Learning App 9th Class Maths Javascript done first, then add and subtract the byjus app 8th class maths javascript is always evaluated from left to right.
If you want to override operator Lorem lpsum 342 boatplans/plans/aluminum-barge-plans-llc more info, you can put parentheses round the parts that you want to be explicitly dealt with. So to get a result of 6, we could do this:. Note : A full list byjus app 8th class maths javascript all JavaScript operators and their precedence can be found in Expressions and operators. Sometimes you'll want to repeatedly add or subtract one to or from a numeric variable value.
Note : These operators are most commonly used in loopswhich you'll learn about later on in the course. For example, say you wanted to loop through a list of prices, and add sales tax to byjus app 8th class maths javascript one.
You'd use a loop to go through each value in Lorem lpsum 342 boatplans/steamboat/steamboat-springs-mountain-university http://myboat342 boatplans/steamboat/steamboat-springs-mountain-university.html and do the necessary calculation for adding the sales tax in each case.
The incrementor is used to move to the next value when needed. We've actually provided a simple example Lorem lpsum 342 boatplans/pontoon-boats/pelican-pontoon-bass-boat-quick read more how this is done � check it out liveand look at the source code to see if you can spot the incrementors! We'll look at loops in detail later on in the course. Let's try playing with these in your console. For a start, note that you can't apply these directly to a number, which might seem strange, but we are assigning a variable a new updated value, not operating on the value.
The following will return an error:. Okay, strangeness number 2! When you do this, you'll see a value of 4 returned � this is because the browser returns the current value, then increments the variable. You can see that it's been incremented if you return the variable value again:. Assignment operators are operators that assign a value to a byjus app 8th class maths javascript. But there are some more complex types, which provide useful shortcuts to keep your code neater and more efficient.
The most common are listed below:. Try typing some of the above examples into your console, to get an idea of how they work. Byjus app 8th class maths javascript each case, see if you can guess what byjus app 8th class maths javascript value is before you type in the second line. Note that you can quite happily use other variables on the right hand side of each expression, for example:.
Note : There are lots of other assignment operators availablebut byjus app 8th class maths javascript are the basic ones you should learn. In this exercise, you will manipulate some numbers and operators to change the size of a box. There is no need to worry about how this works � just concentrate on the math for. The width and height of the box in pixels are defined by the variables x and ywhich are initially both given a value of Open in new window. Let's try the following:.
Don't worry if you totally mess the code up. You can always press the Reset button to get things working. After you've answered all the above questions correctly, feel free to play with the code some more or create your own challenges.
The former versions test whether the values are the same but not whether the values' datatypes are the. The latter, strict versions test the equality of both the values and their datatypes. The strict versions tend to result in fewer errors, so we recommend you use. These are very useful, as they allow us to make decisions in our code, and they are used every time we want to make a choice of some kind. For example, booleans can be used to:.
We'll look at how to code such logic when we look at conditional statements in a future article. For now, let's look at byjus app 8th class maths javascript quick example:. You can see the equality operator being used just inside Lorem lpsum 342 boatplans/class-chapter/byjus-class-10-maths-chapter-6-address just click for source updateBtn function.
In this case, we are not testing if two mathematical expressions have the same value � we are testing whether the text content of a button contains a certain string � but it is still the same principle at work. If the button is currently saying "Start machine" when it is pressed, we change its label to "Stop Lorem lpsum 342 boatplans/yacht/photo-of-mega-yacht-name link, and update the label as appropriate.
If the button is currently saying "Stop machine" when it is pressed, we swap the display back. Note : Such byjus app 8th class maths javascript control that swaps between two states is generally referred to as a toggle.
It toggles between one state and another � light on, light off. You've reached the end of this article, but can you remember the most important information? You can find some further tests to verify that you've retained this information before you move on � see Test your skills: Math. In this article we have covered the fundamental information you need to know about numbers in JavaScript, for.
You'll Lorem lpsum 342 boatplans/steamboat/steamboat-buffet-holland-village-95 see more numbers used again and again, all the way through your JavaScript learning, so it's a good idea to get this out of the way. If you are one of those people that doesn't enjoy math, you can take comfort in the fact that this chapter was pretty short.
Note : If you do enjoy math and want to read more about how it is implemented in JavaScript, you can find a lot more detail in MDN's main JavaScript section. Great places to start are our Numbers and dates and Expressions and operators Lorem lpsum 342 boatplans/dinghy/aluminium-dinghy-for-sale-brisbane-sim click the following article. Previous Overview: First steps Next.
This article discusses only the basic parts that you need to know. We use different terms to describe different types of decimal numbers, for example: Integers are whole byjus app 8th class maths javascript, e. Floating point numbers floats have decimal points and Lorem lpsum 342 boatplans/fishing-boat/loan-to-buy-fishing-boat-60 click at this page places, for example Doubles are a specific type of floating point number that have greater precision than standard floating point numbers meaning that they are accurate to a greater number of decimal places.
Decimal is base 10 meaning it uses 0�9 in each columnbut we also have things like: Binary � The lowest level language of computers; 0s and 1s. Octal � Base 8, uses 0�7 in each column. Lorem lpsum 342 boatplans/boat-excursion/boat-excursions-ocean-city-md-students Click here � Base 16, uses 0�9 and then a�f in each column.
You may have encountered these numbers before when setting colors in CSS. Now let's check that both our original variables are of the same datatype.
There is an operator called typeof in JavaScript that does .
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