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export Arithmetic funcs individually. Use existing Delim

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d98762625 2018-05-15 14:32:39 +01:00
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commit 6ddc1b1c9c
8 changed files with 158 additions and 170 deletions
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262
src/core/lib/Arithmetic.mjs
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@ -8,156 +8,132 @@
import Utils from "../Utils";
import BigNumber from "bignumber.js";
/**
* Arithmetic functions used by Sum, Multiply, Divide, Subtract (etc)
* functions.
* Converts a string array to a number array.
*
* @param {string[]} input
* @param {string} delim
* @returns {BigNumber[]}
*/
class Arithmetic {
export function createNumArray(input, delim) {
delim = Utils.charRep(delim || "Space");
const splitNumbers = input.split(delim);
const numbers = [];
let num;
/**
* @constant
* @default
*/
static get DELIM_OPTIONS() {
return ["Line feed", "Space", "Comma", "Semi-colon", "Colon", "CRLF"];
}
/**
* Converts a string array to a number array.
*
* @private
* @param {string[]} input
* @param {string} delim
* @returns {BigNumber[]}
*/
static _createNumArray(input, delim) {
delim = Utils.charRep(delim || "Space");
const splitNumbers = input.split(delim);
const numbers = [];
let num;
splitNumbers.map((number) => {
try {
num = BigNumber(number.trim());
if (!num.isNaN()) {
numbers.push(num);
}
} catch (err) {
// This line is not a valid number
splitNumbers.map((number) => {
try {
num = BigNumber(number.trim());
if (!num.isNaN()) {
numbers.push(num);
}
});
return numbers;
}
/**
* Adds an array of numbers and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _sum(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.plus(curr));
} catch (err) {
// This line is not a valid number
}
}
});
return numbers;
}
/**
* Subtracts an array of numbers and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _sub(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.minus(curr));
}
}
/**
* Multiplies an array of numbers and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _multi(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.times(curr));
}
}
/**
* Divides an array of numbers and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _div(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.div(curr));
}
}
/**
* Computes mean of a number array and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _mean(data) {
if (data.length > 0) {
return Arithmetic._sum(data).div(data.length);
}
}
/**
* Computes median of a number array and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _median(data) {
if ((data.length % 2) === 0 && data.length > 0) {
data.sort(function(a, b){
return a.minus(b);
});
const first = data[Math.floor(data.length / 2)];
const second = data[Math.floor(data.length / 2) - 1];
return Arithmetic._mean([first, second]);
} else {
return data[Math.floor(data.length / 2)];
}
}
/**
* Computes standard deviation of a number array and returns the value.
*
* @private
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
static _stdDev(data) {
if (data.length > 0) {
const avg = Arithmetic._mean(data);
let devSum = new BigNumber(0);
data.map((datum) => {
devSum = devSum.plus(datum.minus(avg).pow(2));
});
return devSum.div(data.length).sqrt();
}
/**
* Adds an array of numbers and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function sum(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.plus(curr));
}
}
export default Arithmetic;
/**
* Subtracts an array of numbers and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function sub(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.minus(curr));
}
}
/**
* Multiplies an array of numbers and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function multi(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.times(curr));
}
}
/**
* Divides an array of numbers and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function div(data) {
if (data.length > 0) {
return data.reduce((acc, curr) => acc.div(curr));
}
}
/**
* Computes mean of a number array and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function mean(data) {
if (data.length > 0) {
return sum(data).div(data.length);
}
}
/**
* Computes median of a number array and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function median(data) {
if ((data.length % 2) === 0 && data.length > 0) {
data.sort(function(a, b){
return a.minus(b);
});
const first = data[Math.floor(data.length / 2)];
const second = data[Math.floor(data.length / 2) - 1];
return mean([first, second]);
} else {
return data[Math.floor(data.length / 2)];
}
}
/**
* Computes standard deviation of a number array and returns the value.
*
* @param {BigNumber[]} data
* @returns {BigNumber}
*/
export function stdDev(data) {
if (data.length > 0) {
const avg = mean(data);
let devSum = new BigNumber(0);
data.map((datum) => {
devSum = devSum.plus(datum.minus(avg).pow(2));
});
return devSum.div(data.length).sqrt();
}
}