chain-able
Version:
interfaces that describe their intentions.
52 lines (50 loc) • 1.07 kB
JavaScript
const isNullOrUndefined = require('./nullOrUndefined')
/**
* @param {*} x value
* @return {boolean} isReal
*
* @since 3.0.0
* @memberOf is
* @func isReal
* @see is/null
* @see is/undefined
*
* @see http://2ality.com/2013/04/quirk-implicit-conversion.html
* @see https://javascriptrefined.io/nan-and-typeof-36cd6e2a4e43
* @see https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/isNaN
*
* @NOTE eslint-disable-next-line no-self-compare
* && x !== x
*
* @extends isNullOrUndefined
* @variation *not* isNullOrUndefined && false for NaN
*
* @example
*
* isReal(null)
* //=> false
* isReal(void 0)
* //=> false
* const nan = Number(undefined)
* isReal(nan)
* //=> false
*
* isReal({eh: true})
* //=> true
* isReal({})
* //=> true
* isReal(Object)
* //=> true
* isReal([])
* //=> true
* isReal(new Set())
* //=> true
* isReal(function() {})
* //=> true
* isReal('')
* //=> true
* isReal(1)
* //=> true
*
*/
module.exports = x => !isNullOrUndefined(x) && !Number.isNaN(x)