Nodejs Array Type Check isarray(a)

Method Source Code

function isarray(a)
{
    return typeof a == 'object' &&
        typeof a.length == 'number' &&
        isFinite(a.length) &&
        a.length == Math.floor(a.length)
}

Related

1. isArray(input)

   function isArray(input) {
       return Object.prototype.toString.call(input) === '[object Array]';
   

2. isArray(n)

   function isArray(n) {
      return n instanceof Array;
   

3. isArray(o)

   function isArray(o) {
     return Object.prototype.toString.call(o) === '[object Array]';
   

4. isarray(e)

   function isarray(e) {
     return (e.length && typeof e !== "string");