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chapter	21
pageNumber	150

Constants

Constants were introduced in ES6(2015), and use a const keyword. Variables that are declared with const cannot be reassigned or redeclared.

Example:

const VERSION = "1.2";

📝 Task:

Run the program mentioned below and fix the error that you see in the console. Make sure that the code result is 0.9 when it is fixed in the console.
```
const VERSION = "0.7";
VERSION = "0.9";
console.log(VERSION);
```
Write a program that prompts user to enter a temperature in degrees Celsius, then use constant CONVERSION_FACTOR which equals to 9/5 to convert to degrees Fahrenheit.
```
const CONVERSION_FACTOR = 9 / 5;

/* Start your code from here*/
```

💡 Hints:

Visit the Variables chapter for more info about const and also look for "TypeError assignment to constant variable" in search engines to learn a fix.

{% if output.name == "website" %} {% aceeditor compilerTitle="Try it!" %} {% endaceeditor %} {% endif %}