How to Access Internal Object Values in JavaScript?

Accessing Internal Object Values in JavaScript

In JavaScript, an object can refer to values within itself using its internal reference mechanism. However, determining the appropriate syntax to access internal values can sometimes be tricky.

Consider the following JavaScript code:

<code class="js">var obj = {
  key1: "it ",
  key2: key1 + " works!"
};
alert(obj.key2);</code>

This code attempts to access the value of 'key2' based on the value of 'key1'. However, it raises an error because 'key1' is not defined within the scope of 'key2'.

Various methods have been explored to access 'key1's value within 'key2', including:

<code class="js">this.key1
this[key1]
obj.key1
obj[key1]
this["key1"]
obj["key1"]</code>

However, none of these approaches appear to be successful.

Solution:

To access internal values within an object, consider using a function within the object itself. By defining a function within 'obj', you can access internal values (like 'key1') using 'this'. For instance:

<code class="js">var obj = {
  key1: "it ",
  key2: function() {
    return this.key1 + " works!";
  }
};

alert(obj.key2());</code>

In this example, the 'key2' function has access to the 'key1' property within 'obj' through the 'this' keyword. When 'obj.key2()' is called, it returns the concatenated string "it works!".

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