Convert an Array to an Object in JavaScript

Last Updated : 14 May, 2019

Here is a need to convert an array into an object. To do so we are going to use a few of the most preferred methods. First here is a method to know.
Object.assign() method
This method copies the values of all enumerable own properties from source objects(one or more) to a target object.
Syntax:

Object.assign(target, ...sources)

Parameters:

target: It specifies the target object.
sources: It specifies the source object(s).

Example-1: This example converts the array to object by using Object.assign() method. For display it, JSON.stringify() method is used.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Convert Array to Object. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" style="font-size: 16px;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Convert 
    </button> 
    <p id="GFG_DOWN" style="color:green; 
                            font-size: 20px; 
                            font-weight: bold;"> 
    </p> 
    <script> 
        var el_up = document.getElementById("GFG_UP"); 
        var el_down = document.getElementById("GFG_DOWN"); 
        var array = [1, 2, 3, 4]; 
        el_up.innerHTML = "Original Array = [" + array + "]";; 
  
        function gfg_Run() { 
            el_down.innerHTML =  
              JSON.stringify(Object.assign({}, array)); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Example-2: This example converts the array to object by creating a function which adds the array values one by one to the object. For display it, JSON.stringify() method is used.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Convert Array to Object. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" style="font-size: 16px;  
                          font-weight: bold;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Convert 
    </button> 
    <p id="GFG_DOWN" style="color:green; 
                            font-size: 22px;  
                            font-weight: bold;"> 
    </p> 
    <script> 
        var el_up = document.getElementById("GFG_UP"); 
        var el_down = document.getElementById("GFG_DOWN"); 
        var array = ['GFG1', 'GFG2', 'GFG3', 'GFG4']; 
        el_up.innerHTML = "Original Array = [" + array + "]"; 
  
        function toObject(arr) { 
            var rv = {}; 
            for (var i = 0; i < arr.length; ++i) 
                rv[i] = arr[i]; 
            return rv; 
        } 
  
        function gfg_Run() { 
            el_down.innerHTML = JSON.stringify(toObject(array)); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

My Personal Notes

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