number-operator

Because JS uses the IEEE 754 double version (64-bit), and it has this problem as long as it uses the IEEE 754 language. So when we calculate the number operation, there will be a precision error

Installation

npm install -D number-operator

Usage

Normal environment computing

> console.log(0.1+0.2); 
0.30000000000000004 ❌

> console.log(0.3-0.1);
0.19999999999999998 ❌

> console.log(0.1*0.2);
0.020000000000000004 ❌

> console.log(0.3/0.2);
1.4999999999999998 ❌

use number-operator

require('number-operator');
or
//import 'number-operator'

> console.log((0.1)._plus_(0.2));
0.3 🙆

> console.log((0.3)._minus_(0.1));
0.2 🙆

> console.log((0.1)._times_(0.2));
0.02 🙆

> console.log((0.3)._div_(0.2));
1.5 🙆

chained call

> console.log((0.3)._minus_(0.1)._plus_(0.1));
0.3 🙆

String type can also be used

> console.log(('0.3')._minus_(0.1)._plus_('0.1'));
0.3 🙆