@studiometa/js-toolkit/utils/is.js

A set of useful little bits of JavaScript to boost your project! 🚀

const isDev = typeof __DEV__ !== "undefined" && __DEV__;
const isNull = (value) => value === null;
const isFunction = (value) => typeof value === "function";
const isDefined = (value) => typeof value !== "undefined";
const isString = (value) => typeof value === "string";
const isObject = (value) => typeof value === "object" && !!value && value.toString() === "[object Object]";
const isNumber = (value) => typeof value === "number" && !Number.isNaN(value);
const isBoolean = (value) => typeof value === "boolean";
const isArray = Array.isArray;
const isEmptyString = (value) => isString(value) && value.length === 0;
const isEmpty = (value) => {
  if (isNull(value) || !isDefined(value)) {
    return true;
  }
  if (isString(value) || isArray(value)) {
    return value.length === 0;
  }
  if (isObject(value)) {
    return value.constructor === Object && Object.keys(value).length === 0;
  }
  return false;
};
export {
  isArray,
  isBoolean,
  isDefined,
  isDev,
  isEmpty,
  isEmptyString,
  isFunction,
  isNull,
  isNumber,
  isObject,
  isString
};
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