// units

// load math.js
var math = require('../index');

/**
 * Helper function to output a value in the console. Value will be formatted.
 * @param {*} value
 */
function print (value) {
  var precision = 14;
  console.log(math.format(value, precision));
}

// units can be created by providing a value and unit name, or by providing
// a string with a valued unit.
console.log('create units');
var a = math.unit(45, 'cm');
var b = math.unit('0.1m');
print(a);                             // 450 mm
print(b);                             // 100 mm
console.log();

// units can be added, subtracted, and multiplied or divided by numbers
console.log('perform operations');
print(math.add(a, b));                // 0.55 m
print(math.multiply(b, 2));           // 200 mm
console.log();

// units can be converted to a specific type, or to a number
console.log('convert to another type or to a number');
print(b.to('cm'));                    // 10 cm  Alternatively: math.to(b, 'cm')
print(math.to(b, 'inch'));            // 3.937 inch
print(b.toNumber('cm'));              // 10
print(math.number(b, 'gram'));        // 10
console.log();

// the expression parser supports units too
console.log('parse expressions');
print(math.eval('2 inch to cm'));     // 5.08 cm
print(math.eval('cos(45 deg)'));      // 0.70711
console.log();

// convert a unit to a number
// A second parameter with the unit for the exported number must be provided
print(math.eval('number(5 cm, mm)')); // Number, 50