basic-calculator

A basic calculator.

Features

• Basic Mathematic Operations (add, subtract, division, multiplication, modulus, square, square root, powers)
• Standard Deviation
• Population Standard Deviation
• Min (from array)
• Max (from array)
• Mode , Median, Mean
• Simple and Precision rounding
• Slope
• Calculate Percentages
• Random number generation between min/max
• Assertion Tests

Installation

npm install basic-calculator --save

Run Tests

npm test

Usage

var bc = require('basic-calculator');
 
// add
bc.add(1,2);
// 3
 
// subtract
bc.sub(1,2);
//-1
 
// division
bc.div(1,2);
// 0.5
 
// multiplication
bc.mult(2,3);
// 6
 
// modulus
bc.mod(5, 2);
// 1
 
// power
bc.pow(2,10);
// 1024
 
// square
bc.sqr(5);
// 25
 
// square root 
bc.sqrt(49);
// 7
 
// percent
bc.perc(1, 5);
// 20
 
// slope
bc.slope([1,-4], [-4, 2]);
// -1.2
 
// mean
bc.mean([3,4,5,6,7]);
// 5
 
// median (even length)
bc.median([1,2,3,4]);
// [2,3]
 
// median (odd length)
bc.median([1,2,3]);
// 2
 
// mode (no ties)
bc.mode([1,2,3,3,4,5]);
// [3]
 
// mode (with ties)
bc.mode([1,1,2,3,4,4,5]);
// [1,5]
 
// max 
bc.max([20,4,1,5,6,29,90]);
// 90
 
// min
bc.min([12,15,90,11,904,2]);
// 2
 
// round up 
bc.round(6.5);
// 7
 
// round down
bc.round(6.49);
// 6
 
// round to specific number of decimals
bc.roundTo(6.55, 1);
// 6.6
 
// standard deviation 
bc.sdeviation([9,2,5,4,12,7,8,11,9,3,7,4,12,5,4,10,9,6,9,4]);
// 3.0607876523260447
 
// population standard deviation
bc.psdeviation([9,2,5,4,12,7,8,11,9,3,7,4,12,5,4,10,9,6,9,4]);
// 2.9832867780352594
 
// variance of standard deviation rounded to 4 digits
var variance = bc.variance([9,2,5,4,12,7,8,11,9,3,7,4,12,5,4,10,9,6,9,4], 'standard');
var rounded = bc.roundTo(variance, 4);
// 9.3684
 
// variance of population standard deviation
bc.variance([9,2,5,4,12,7,8,11,9,3,7,4,12,5,4,10,9,6,9,4], 'population');
// 8.9
 
// random number between 10-100
bc.random(10,100);
// 55
 
// random number between defaults (1,10)
bc.random();
// 5