@hugoalh/pressure v2.0.2

Pressure (NodeJS)

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📝 Description

A NodeJS module to convert pressure units.

Units of pressure are from "Wikipedia - Pressure measurement - Units".

📋 Notice

This module uses the built in JavaScript Number type, which is a floating point number with a limited precision of 64 bits, about 16 digits. Floating point numbers round-off errors can occur during calculations:

0.1 + 0.2;
//=> 0.30000000000000004

In most cases, round-off errors do not matter, they have no significant impact on the results. However, it looks ugly when displaying output to a user. A solution is to limit the precision just below the actual precision of 16 digits in the displayed output:

(0.1 + 0.2).toPrecision(14);
//=> 0.3

📚 Documentation

Getting Started

• NodeJS ^ v12.20.0 || ^ v14.15.0 || >= v16.13.0

npm install @hugoalh/pressure

/* Either */
import { ... } from "@hugoalh/pressure";// Named Import
import * as pressure from "@hugoalh/pressure";// Namespace Import
import Pressure from "@hugoalh/pressure";// Default Import (Class `Pressure`)

API

Class

• new Pressure(value: number, unit: PressureUnits | string = "Pa"): Pressure;
    .toJSON(keyType: PressureToJSONKeyType = "symbolASCII"): { [x: string]: number; };// Get all of the units value.
    .toStringASCII(unit: PressureUnits | string = "Pa"): string;// Get unit's value with ASCII symbol.
    .toStringStandard(unit: PressureUnits | string = "Pa"): string;// Get unit's value with Standard symbol.
    .toValue(unit: PressureUnits | string = "Pa"): number;// Get unit's value.
  
  Pressure.difference(a: Pressure, b: Pressure): PressureDifference;// Calculate pressure difference by units.
  Pressure.unit(unit: PressureUnits | string): PressureUnitMeta;// Get a pressure unit meta.
  Pressure.units(): PressureUnitMeta[];// Get all of the pressure units meta.
  Pressure.unitSI(): PressureUnitMeta;// Get pressure SI unit meta.

Interface / Type

• type PressureToJSONKeyType = "nameASCII" | "nameStandard" | "symbolASCII" | "symbolStandard";

• type PressureUnitMeta = {
    isSIUnit: boolean;
    nameASCII: string;
    nameStandard: string;
    symbolASCII: string;
    symbolStandard: string;
  };

Example

new Pressure(1, "Bar").toValue("Pa");
//=> 100000

new Pressure(1, "Bar").toStringStandard("Pa");
//=> "100000 Pa"

new Pressure(100000).toValue("Bar");
//=> 1

new Pressure(100000).toStringStandard("Bar");
//=> "1 bar"