Experimenting a different style of programming. Where every validation method on success calls a function with the said data as an argument.

Helpers.js

export const toProperCase = (string) => {
  return (
    string.charAt(0).toUpperCase() + string.toLowerCase().substr(1)
  )
}

// Usecase:
// isNotEmptyString(firstName, (firstName) => { // do something... }
//
export const isNotEmptyString = (variable, func) => {
  if (variable !== "") {
    return func.call(null, variable);
  } else {
    return null;
  }
}

// Usecase:
// isNotNull(imageUrl, (imageUrl) => { // do something... }
//
export const isNotNull = (variable, func) => {
  if (variable !== null) {
    return func.call(null, variable);
  } else {
    return null;
  }
}

// Usecase:
// isLengthNotEmpty(rows, (rows) => { // do something... }
//
export const isLengthNotEmpty = (variable, func) => {
  if (variable.length >= 1) {
    return func.call(null, variable);
  } else {
    return null;
  }
}

// Usecase:
// isObjectLengthNotEmpty(users, (users) => { // do something... }
//
export const isObjectLengthNotEmpty = (variable, func) => {
  if (Object.keys(variable).length >= 1) {
    return func.call(null, variable);
  } else {
    return null;
  }
}