why are objects wrapped in parenthesis in JS?

Question

Given the following example:

var foo = {
    root:
        ({
            key1: \"Value1\",
            key2: \"Value2\",
            key3: \"Value3\"
               


        

Answer 1

As per me, we should use square brackets to collect the objects. because, JavaScript will understand that it is an array.

Round brackets(used in example 1) are just validated by the javasript parser. When you try to access it, java script returns Only last object in the round brackets(like top object in the stack).

Try below script

var foo = {
    root1:
        {
            key1: "Value1",
            key2: "Value2",
            key3: "Value3"
        },
    root2:({
            key4: "Value4",
            key5: "Value5"
          },{
            key6: "Value6",
            key7: "Value7"
        }),
    root3:[
         {
            key8: "Value8",
            key9: "Value9"
          },{
            key10: "Value10",
            key11: "Value11"
          }
    ]
    };
    console.log(foo['root1']);  // returns object { key1, key2, key3}
    console.log(foo['root2']);  // returns only { key6,key7}
    console.log(foo['root3']);  //returns [ {key8,key9},{key10,key11}]