ReactJs Global Helper Functions

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You can export multiple functions from a file, no React needed per se:

Helpers.js:

export function plus(a, b) {
  return a + b;
}

export function minus(a, b) {
  return a - b;
}

export function multiply(a, b) {
  return a * b;
}

export function divide(a, b) {
  return a / b;
}

You can then import the functions you need:

import { multiply, divide } from './Helpers'

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