Multiple validation conditions

validation.js

const isTruthy = param => !!param;
const isString = param => typeof (param) === 'string';
const isNumeric = param => /^\d+$/.test(param);


const makeConditionalMethod = (method, required = false) => (...params) => {
  const res = method(...params);
  const valid = isTruthy(...params);
  if (required) {
    return valid && res;
  }
  return valid ? res : true;
}

const isStringRequired = makeConditionalMethod(isString, true);
const isNumericRequired = makeConditionalMethod(isNumeric, true);

const fieldValidation = {
  "field1": isStringRequired,
  "field2": [isNumericRequired],
}

const data = {
  field1: "123",
  field2: "ahihi",
}

for (const key in data) {
  if (fieldValidation.hasOwnProperty(key)) {
    let funcs = fieldValidation[key];
    if (typeof (funcs) === 'function') {
      funcs = [funcs];
    }
    const result = funcs.map(func => func(...data[key]));
    console.log(result.every(Boolean))
  }
}