javascript-calculator | School assignment were we had to create a calculator | Apps library
kandi X-RAY | javascript-calculator Summary
kandi X-RAY | javascript-calculator Summary
This was the final assignment of my freshman year. We had to build a calculator using Javascript without using eval. I decided to separate all functionality by defining several classes. My application relies heavily on recent ES6 functions such as string literals, classes and arrow functions. Also I use local storage.
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- Handle button click
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QUESTION
I am stuck at the two tests of FCC's JS calculator Project. Here is the FCC's link:https://www.freecodecamp.org/learn/front-end-development-libraries/front-end-development-libraries-projects/build-a-javascript-calculator
Here is my Codepen: https://codepen.io/tanjimanim/pen/jOwoYrV
I can't pass the two tests which are:
- When the decimal element is clicked, a "." should append to the currently displayed value; two "." in one number should not be accepted.
- If 2 or more operators are entered consecutively, the operation performed should be the last operator entered (excluding the negative (-) sign.
Here is my component
...ANSWER
Answered 2021-Oct-25 at 17:55With the help of a friend, here is the updated codepen:https://codepen.io/tanjimanim/pen/jOwoYrV?editors=0110
It is not quite pretty but it is workable and passes all the tests.
//component
QUESTION
There is one project challenge on freecodecamp about building a calculator and I just managed to pass all the tests but when looking back on my code, the section dealing with the operations are barely readable. I've read some articles online regarding how to reduce the complexity of conditionals and the principles to keep in mind for more easy-to-understand logic.
However, figuring out the achievable logics for this task in javascript is quite challenging to me now. I was trying to meet two conditions with this section of code as follows:
User Story #13: If 2 or more operators are entered consecutively, the operation performed should be the last operator entered (excluding the negative (-) sign). For example, if 5 + * 7 = is entered, the result should be 35 (i.e. 5 * 7); if 5 * - 5 = is entered, the result should be -25 (i.e. 5 * (-5)).
User Story #14: Pressing an operator immediately following = should start a new calculation that operates on the result of the previous evaluation.
Here is the link to the page for this particular challenge and this is the link to the code I wrote by far.
Is there any tips and advice on refining the code or other approaches for coping with this part?
...ANSWER
Answered 2021-Jun-09 at 07:39Break down the process to the basic steps:
- get the operation(s) from the string
- get the numbers from the string
- do the operation
Here's a snippet for this:
QUESTION
I am a beginner in coding and while following YouTube channel WebDevSimplified, I came across below JS code for making a calculator. In the below code, I am not able to understand, how currentOperand and previousOperand are being used without defining? It looks like currentOperand is referencing to currentOperandTextElement and previousOperand to previousOperandTextElement, However its not defined anywhere in code. below is the link for GitHub repo
https://github.com/WebDevSimplified/Vanilla-JavaScript-Calculator/blob/master/script.js
Request you all to help me understand. Thank you so much.
...ANSWER
Answered 2021-May-25 at 16:42currentOperand and previousOperand are dynamically being created as fields on the class Calculator. Since both of them were not defined in the constructor, their initial value is undefined.
For example, as operations are performed on the calculator by appendNumber, this.currentOperand is assigned a value, which can be used later by chooseOperation() and compute().
QUESTION
In a Javascript Calculator being built with React, there is a switch statement that is intended to return a function. It appears that switch statements are allowed to return if they are in a function. However, there is an error when returning the function from the switch statement: TypeError: func is not a function.
Any help would be greatly appreciated.
index.js
...ANSWER
Answered 2020-Sep-19 at 00:41You try to use an operator for every number in the input text. But usually there will be more numbers than operators, so this will fail for the last number that doesn't have an operator associated.
The returnFunc function will then be called with undefined because the operators array is empty. And will in this case also return undefined instead of a function.
You start with answer = 0 and then do the first operation. Instead, start with answer being the first number and then do the first operation with the second number and so forth
QUESTION
In this React Javascript Calculator, there is a function that pushes operators onto an array so that the length of the array can be used to limit the number of decimal points allowed in a number to one decimal point per operator. An operator can immediately be entered successfully after a browser reset, but not after the clear button is clicked. Any help would be greatly appreciated.
index.js
...ANSWER
Answered 2020-Sep-21 at 17:35When you run your clear function,
QUESTION
In this React Javascript Calculator, decimal points are able to be added to numbers, but only after a complete browser refresh, and not after clicking the clear button which triggers the clear() function. How can state be completely and totally reset in the clear() function so that state becomes as if a browser refresh had been done. Any help would be greatly appreciated.
index.js
...ANSWER
Answered 2020-Sep-21 at 04:31Try to create a variable copy your init state then replace it when you want to clear, like bellow example
QUESTION
In this React Javascript Calculator this.setState({ array: displayed}); is supposed to update the array in state, but it doesn't. Is there a way to force it? Any help would be greatly appreciated.
index.js
...ANSWER
Answered 2020-Sep-21 at 00:41setState is async. It won't work how you're using it. In your case, you should just pass the displayed array to the calculate function.
QUESTION
There is a
TypeError: null is not an object (evaluating 'document.getElementById(id).innerHTML = "0"')
All the buttons using this.display(e.target.id) work. Only the "clear" button which uses this.clear('display') doesn't work.
Any help would be greatly appreciated.
index.js:
...ANSWER
Answered 2020-Sep-17 at 18:27You could use state for the numbers x and y.
And then have a function to reset by just setting x and y to 0.
QUESTION
I'm doing a ReactJS calculator, and I want to be able to click the numbers on my keyboard and that showing on my calculator. I wrote the following handler:
...ANSWER
Answered 2020-Jun-11 at 19:14Assuming the calculator is the only thing in the page, the easiest way to solve this is to put the handler for keyPress on the div that covers the whole page. You'll have to refactor some of your other code to get it to work however.
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