JAVASCRIPT

access key of object javascript

var obj = { first: 'someVal', second: 'otherVal' };
alert(Object.keys(obj)[0]); // returns 'first'
alert(Object.keys(obj)[1]); // returns 'second'

how to access key of object in javascript

const object1 = { a: 'somestring', b: 42, c: false };

console.log(Object.keys(object1)); // expected output: Array ["a", "b", "c"]

access key of object javascript

if(!Object.keys) Object.keys = function(o){
     if (o !== Object(o))
          throw new TypeError('Object.keys called on non-object');
     var ret=[],p;
     for(p in o) if(Object.prototype.hasOwnProperty.call(o,p)) ret.push(p);
     return ret;
}