math-helper-functions
Advanced tools
Helper with misc. math functions such as sums, averages, max, min, etc
Using npm, npm i math-helper-functions.
Using yarn, yarn add math-helper-functions.
Using import
import { calcSum } from 'math-helper-functions';
const input = [
{ item: 'bookA', count: 3 },
{ item: 'bookB', count: 4 },
];
const totalBooks = calcSum(input, 'count'); // totalBooks is 7
In a CommonJS environment
const { calcDomain } = require('math-helper-functions');
const input = [
{ item: 'bookA', count: 3 },
{ item: 'bookB', count: 10 },
{ item: 'bookC', count: 1 },
];
const domain = calcDomain(input, 'count'); // domain is [1, 10]
▸ calcDiff(array, property?): number
Gets the absolute difference between the max and min value in an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
number
Absolute difference between the max and min of an array
Export
▸ calcDistribution(array, strict?, numOfBins?): IDistribution
Calculates the distribution of an arrays values
| Name | Type | Default value | Description |
|---|---|---|---|
array | number[] | undefined | Input array |
strict | boolean | false | |
numOfBins? | number | undefined | Number of bins to use |
IDistribution
The distribution
Export
▸ calcDistributionAsArray(array, binsStrict?, numOfBins?): IDistributionArrayItem[]
Calculates the distribution of an arrays values and outputs an array
| Name | Type | Default value | Description |
|---|---|---|---|
array | number[] | undefined | Array to calc distribution of |
binsStrict? | boolean | false | If false, buckets may be rounded [floor, ceil] |
numOfBins? | number | undefined | Number of bins to use |
IDistributionArrayItem[]
The distribution as an array of objects
Export
▸ calcDomain(array, property?): [number, number] | [any, any]
Gets the [min, max] value in an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
[number, number] | [any, any]
The domain
Export
▸ calcHistogram(array, numberOfBins?, property?): number[]
Calculates a histogram from array values
| Name | Type | Default value | Description |
|---|---|---|---|
array | any[] | undefined | Input array |
numberOfBins? | number | 4 | Number of bins to use |
property? | string | undefined | Property to map by |
number[]
The histogram
Export
▸ calcMax(array, property?): number
Gets the max value in an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
number
The maximum value in the array
Export
▸ calcMean(array, property?): number | undefined
Gets the mean value for an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
number | undefined
The mean value
Export
▸ calcMedian(array, property?): number | undefined
Gets an array median
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | The property to map by |
number | undefined
The resulting median
Export
▸ calcMin(array, property?): number
Gets the min value in an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map |
number
The minimum value in the array
Export
▸ calcPercent(toCalc, total): number
Calculates the percentage of a value, given a total
| Name | Type | Description |
|---|---|---|
toCalc | number | Number to get percentage of |
total | number | Total |
number
Percentage of the total
Export
▸ calcQuartiles(array, property?): [number, number, number]
Gets the quartiles of an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
[number, number, number]
The quartiles
Export
▸ calcStdDeviation<T>(array, property?): number | undefined
Calculates the standard deviation in an array of numbers
| Name |
|---|
T |
| Name | Type |
|---|---|
array | T[] |
property? | string |
number | undefined
Export
▸ calcSum(array, property?): number
Gets the sum of the values in an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
property? | string | Property to map by |
number
The sum
Export
▸ calcVariance<T>(array, property?): number | undefined
Calculates the variance in an array of numbers
| Name |
|---|
T |
| Name | Type |
|---|---|
array | T[] |
property? | string |
number | undefined
Export
▸ calcWeightedMean(array, valueProperty, weightProperty): number
Gets the weighted mean for an array
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
valueProperty | string | Property to use for value |
weightProperty | string | Property to use for weight |
number
The weighted mean
Export
▸ calcWeightedMedian(array, valueProperty, weightProperty): number
Gets an array weighted median
| Name | Type | Description |
|---|---|---|
array | any[] | Input array |
valueProperty | string | The property to use as value |
weightProperty | string | The property to use as weight |
number
The resulting median
Export
▸ getMinMaxFromBucket(bucketLabel): number[]
Gets the min and max values for a calcDistribution bucket
| Name | Type | Description |
|---|---|---|
bucketLabel | string | The bucket label |
number[]
[min, max]
Export
▸ ruleOfThree(ifThis, isThis, thenThat): number
Performs a simple rule of three
| Name | Type | Description |
|---|---|---|
ifThis | number | First param |
isThis | number | First result |
thenThat | number | Second param |
number
Second result
Export
FAQs
Helper with misc. math functions such as sums, averages, max, min, etc
The npm package math-helper-functions receives a total of 130 weekly downloads. As such, math-helper-functions popularity was classified as not popular.
We found that math-helper-functions demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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