Summary  
This chapter covers the naming convention for constants in code, recommending UPPERCASE identifiers to distinguish immutable values.  

General domain of usage  
Time unit calculations (e.g., computing the number of seconds in a day)

### Constant naming convention

Constants are planned to be non-changing variables. It is best to practice to distinguish constants from other variables and the best way to write them is in UPPERCASE (capital letters).

// UPPERCASE
const SECONDS = 60;
const MINUTES = 60;
const HOURS = 24;
const DAY = SECONDS * MINUTES * HOURS;
console.log(DAY);

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The syntax of the JavaScript programming language is the set of rules that defines how a JavaScript program will be written and interpreted (by both the runtime system and by human readers).

JavaScript is dynamically typed (also called loosely typed) scripting language. That is, in javascript variables can receive different data types over time. Datatypes are basically typed of data that can be used and manipulated in a program.

Constant Naming Convention

Constant naming convention

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