tether/src/js/utils/type-check.js

A client-side library to make absolutely positioned elements attach to elements in the page efficiently.

/**
 * Checks if `value` is classified as a `Function` object.
 * @param {*} value The param to check if it is a function
 */
export function isFunction(value) {
  return typeof value === 'function';
}

/**
 * Checks if `value` is classified as a `Number` object.
 * @param {*} value The param to check if it is a number
 */
export function isNumber(value) {
  return typeof value === 'number';
}

/**
 * Checks if `value` is classified as an `Object`.
 * @param {*} value The param to check if it is an object
 */
export function isObject(value) {
  return typeof value === 'object';
}

/**
 * Checks if `value` is classified as a `String` object.
 * @param {*} value The param to check if it is a string
 */
export function isString(value) {
  return typeof value === 'string';
}

/**
 * Checks if `value` is undefined.
 * @param {*} value The param to check if it is undefined
 */
export function isUndefined(value) {
  return value === undefined;
}