Introduction to Number Precision

In the world of software development, achieving high accuracy in arithmetic operations involving floating-point numbers is crucial. The number-precision library is a powerful tool that provides high-precision computations. This library ensures that the results of arithmetic operations on floating-point numbers are accurate and reliable.

Useful APIs in Number Precision

Here are some of the core APIs provided by the number-precision library with examples:

NP.strip(number)

Removes any unnecessary decimals from a number.

  const NP = require('number-precision');
  let result = NP.strip(0.09999999999999998); // result will be 0.1
  console.log(result);

NP.plus(num1, num2, …)

Performs precise addition of multiple numbers.

  const result = NP.plus(0.1, 0.2, 0.3); // result will be 0.6
  console.log(result);

NP.minus(num1, num2, …)

Performs precise subtraction of multiple numbers.

  const result = NP.minus(1.0, 0.9); // result will be 0.1
  console.log(result);

NP.times(num1, num2, …)

Performs precise multiplication of multiple numbers.

  const result = NP.times(0.7, 100); // result will be 70
  console.log(result);

NP.divide(num1, num2)

Performs precise division of two numbers.

  const result = NP.divide(0.3, 0.1); // result will be 3
  console.log(result);

NP.round(number, decimalPlaces)

Rounds a number to the specified decimal places.

  const result = NP.round(1.005, 2); // result will be 1.01
  console.log(result);

Example Application

Let’s create a simple application that demonstrates the usage of these APIs. We will calculate the total price of items in a shopping cart with accurate decimal calculations.

  const NP = require('number-precision');
  
  let cart = [
    { name: "Apple", price: 0.1, quantity: 3 },
    { name: "Banana", price: 0.2, quantity: 2 },
    { name: "Cherry", price: 0.3, quantity: 1 }
  ];

  let total = cart.reduce((sum, item) => {
    return NP.plus(sum, NP.times(item.price, item.quantity));
  }, 0);

  console.log(NP.round(total, 2)); // result will be 0.9

This example showcases how number-precision can be utilized to handle arithmetic operations in real-world applications where precision is crucial.

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