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How to create a variable using a user-defined name in JavaScript ?

  • Last Updated : 21 May, 2021

In this article, we will learn to create a variable using the user-defined name in JavaScript. 

Variables in JavaScript:

Basically, it is a container that holds reusable data in JavaScript. The variable’s value can be changed during program execution and should be declared before using it.  Before ES6 declares a variable, we just use the var keyword to create a variable, but ES6 and later, two more keywords were added to create a variable namely let and const. 

Approach:

In JavaScript, it is possible to create a variable using a user-defined name. First, we will create a variable using an object then, we will create a variable using this keyword. 



Example 1:  Create a variable using a user-defined name in JavaScript with the help of an object.

Javascript




<script>
  // A user-defined variable created
  let my_var = "userVariable";
  let my_value = "userValue";
  
  let x = {
    // Assign value of a user-defined variable
    [my_var]: my_value,
  };
  console.log(x);
  console.log(x[my_var]);
</script>

Output:

Example 2:  Create a variable using a user-defined name in JavaScript with the help of this keyword. 

Javascript




<script>
  let var_name = "newVariable";
  let var_value = "newValue";
  
  this[var_name] = var_value;
  console.log(var_name);
  console.log(this[var_name]);
</script>

Output:

Conclusion: In this article, we learned to create a variable using the user-defined name in JavaScript with the help of two suitable approaches.




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