This package provides a simple calculator class and several "safe" mathematical operations, in which all undefined or infinite results are replaced with 0. It is a simple educational project using a range of fully-configured and integrated external tools.
This is a simple educational project to set up and work with a variety of libraries and external tools. Among others, it uses:
git commit
to push commits, you use yarn commit
, which invokes commitizen.The repository also features Github issue templates, a pull request template, a code of conduct and a contributing guideline.
Explore some of the tools above and look at the configuration for each to see how they are used and start using them in your own projects, if they fit your needs.
If you want to suggest changes or additions, find an error or that anything does not work or no longer works, please file an issue or submit a pull request with your suggested changes.
Install the package from NPM:
# If you use yarn
yarn add example-calculator
# If you use NPM
npm install example-calculator
You can also import the package bundle from unpkg by inserting the following script tag in your HTML code.
<script src="https://unpkg.com/example-calculator/example-calculator.umd.min.js"></script>
The module content will be available as the UMD global exampleCalculator
.
The package provides a calculator class.
import Calculator from "example-calculator";
const calculator = new Calculator();
You can supply an initial value to the calculator as an argument to its constructor (by default 0).
const calculator2 = new Calculator(2);
The current value of the calculator can be accessed using the value()
method.
console.log(calculator.value());
// Prints 0
console.log(calculator2.value());
// Prints 2
clear()
resets the value in the memory of the calculator to 0. All operations of the calculator, apart from value()
return the instance, so operations can be chained.
console.log(calculator2.clear().value());
// Prints 0
The calculator provides a range of simple mathematical operations, which perform an operation on the value in memory.
// Adds 2 to the current value in memory
calculator.add(2);
// Subtracts 1 from the current value in memory
calculator.sub(1);
// Multiplies the current value in memory with 2
calculator.mul(2);
// Divides the current value in memory by 2
calculator.div(2);
// Sets the value in memory to the modulus (remainder) of the current value and 3
calculator.mod(3);
// Sets the value in memory to the exponentiated current value
calculator.exp();
// Sets the value in memory to the natural logarithm of the current value
calculator.ln();
// Sets the value in memory to sine of the current value
calculator.sin();
// Sets the value in memory to cosine of the current value
calculator.cos();
// Sets the value in memory to tangent of the current value
calculator.tan();
// Sets the value to the inverse (1/x) of the current value
calculator.inverse();
Some mathematical operations are not defined for all values, such as division by 0 or the logarithm of a negative number or 0. In all of these circumstances, the return values are 0.
calculator.clear().add(1).div(0).value();
// Returns 0
calculator.clear().add(1).mod(0).value();
// Returns 0
calculator.clear().sub(1).ln().value();
// Returns 0
calculator.clear().inverse().value();
// Returns 0
You can also import some operations as standalone functions from their submodules:
import add from "example-calculator/add";
import sub from "example-calculator/sub";
import mul from "example-calculator/mul";
import div from "example-calculator/div";
import mod from "example-calculator/mod";
import ln from "example-calculator/ln";
console.log(add(1, 1));
// Prints 2
console.log(sub(1, 1));
// Prints 0
console.log(mul(2, 2));
// Prints 4
console.log(div(6, 3));
// Prints 2
console.log(mod(6, 4));
// Prints 2
console.log(ln(1));
// Prints 0
Please read CODE_OF_CODUCT.md for details on our code of conduct and CONTRIBUTING.md for all details on how to contribute to this project (with code or otherwise) and the process for submitting pull requests to us.
We use SemVer for versioning. Releases are generated using semantic-release. For the versions available, see the tags on this repository.
This project is licensed under the MIT License - see the LICENSE file for details.
See also the list of contributors who participated in this project.
Thanks goes to these wonderful people (emoji key):
Frédérique Mittelstaedt 📖 ⚠️ 💻 |
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This project follows the all-contributors specification. Contributions of any kind welcome!