GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Objective: Build a CodePen. Fulfill the below user stories. Use whichever libraries or APIs you need. Give it your own personal style. User Story: I can keep chaining mathematical operations together until I hit the equal button, and the calculator will tell me the correct output.
Copy these codes and save it with the name that is given here. I would recommend that first understand this code and then use it anywhere. So, if you have to make it yourself, you do not have to copy the code repeatedly. I had been created in 2 separate files So that the code does not get long. I Know this is very basic, but always remember basic is most important.
This is my Opinion. Hope you enjoyed this article, if you feel this is useful for you, then you can increase our morale by sharing. If you have any questions or want to say something, then you can comment below.
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Minimally, you need to know these things:. I urge you to try and build the calculator yourself before following the lesson. This has already been done for you in the starter file. You can find the starter file at this pen.
The first steps to building this calculator are to be able to 1 listen for all keypresses and 2 determine the type of key that is pressed. In this case, we can use an event delegation pattern to listen, since keys are all children of. Next, we can use the data-action attribute to determine the type of key that is clicked.
If the key has a data-action that is either addsubtractmultiply or dividewe know the key is an operator. At this point, if the calculator shows 0 the default numberthe target number should replace zero. If the calculator shows a non-zero number, the target number should be appended to the displayed number. We can get these two values through the textContent property of the clicked key and.
If the calculator shows a non-zero number, we want to append the clicked key to the displayed number. To append a number, we concatenate a string.
When Mary hits the decimal key, a decimal should appear on the display. If Mary hits any number after hitting a decimal key, the number should be appended on the display as well.Cognia performance standards
If Mary hits an operator key, the operator should be highlighted so Mary knows the operator is active. When Mary hits a number key again, the previous display should be replaced with the new number. The operator key should also release its pressed state. To release the pressed state, we remove the is-depressed class from all keys through a forEach loop:.Hey web people!
Passing a 2 as the last number maximizes the console. In this way you could share a Pen where the output is intentionally only for the console. Babel, awesomely, also supports the JSX syntax. TypeScript will process the JSX as well!Kuwait food company
In some sense, people can learn from any Pen on CodePen. Some people even make Pens that are specifically about teaching something. Our blogging feature is used almost entirely for technical writing in the spirit of teaching.
But CodePen has other, more direct ways of teaching.
The 'use strict' directive tells the engine to run the code in strict mode. In a nutshell, strict mode throws more errors, prohibits the dreaded with statement, and throws an error if you try to assign to an undeclared variable. It's useful for finding mistyped variables:. You should use strict mode all the time, in development and production, unless you need a 0.
If you use Babel it outputs code in strict mode. But try to avoid using! Also, you can set cursor: pointer on. There's no visual difference, except for the specificity of the selectors. It does what you think it'll do. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
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This code can be used as your calculator to any mathematical problem. So Let's do the coding. This code contains the main function of the application. This code is the source code of the calculator that display the designed of the application. This will calculate the equation when the equal button is pressed. To create this just write these block of code inside the text editor. Note: Due to the size or complexity of this submission, the author has submitted it as a.
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