JavaScript How to print array elements? print array elements in java,print array elements in c,

I am trying to print array element to console using for each loop in javascript. But I am printing something which I am not able to figure out what!

 let arr=["1,2,3","iosajah","undefined"];
    for(let data in arr)
    { 
        console.log(data);// prints 4,0,1,2 
        if(typeof data === "undefined")
        {
          //do something

        }
    }   

console.log(data) prints 4,0,1,2

but I expected it to print each array element

Answer:1

for in loop is used to iterate through object literals, but since Arrays (and everything else) are actually objects in JavaScript you are actually logging the keys of the Array object which are the index values.

You want to use forEach

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

let arr=["1,2,3","iosajah","undefined"];

arr.forEach(function(element) {
  console.log(element);
});
Answer:2

Your For/In statement is to traverse properties of an object. If you check the length of your array and step through it. We want values, rather than properties. You can print it this way.

let arr=["1,2,3","iosajah","undefined"];
    for(i=0;i<arr.length;i++)
      {
       console.log(arr[i]);
       if(typeof data === "undefined"){
       //do something
      }
    }
Answer:3

for in loops over enumerable property names of an object, you are printing the indexes of the array. If you want to iterate over the values use one of the approaches:

for(let value of array)

Or

Object.keys(array).map(key => console.log(array[key]))
Answer:4

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