ECMAScript 6+ (ES6+) – Using the const keyword
ES6 introduced the const keyword as a way to declare variables in JavaScript that are immutable or read-only. When a variable is declared using const, it cannot be reassigned a new value once it has been initialized.
Here is an example of how you can use the const keyword in JavaScript:
const PI = 3.14159; console.log(PI); // Output: 3.14159 // Trying to reassign the value of a const variable will result in an error PI = 3.14; // Error: Assignment to constant variable
It is important to note that while the value of a variable declared with const cannot be changed, if the variable holds a reference to an object or array, the properties of that object or array can still be modified.
For example:
const person = { name: "Alice", age: 30 };
person.age = 31; // This is allowed
console.log(person); // Output: { name: "Alice", age: 31 }
When developing WordPress plugins using ES6+, using the const keyword can help maintain the integrity of your code by preventing accidental reassignment of variables. It also makes your code more readable by clearly indicating which variables are meant to be constant.
Overall, the const keyword in ECMAScript 6+ is a valuable tool for ensuring the immutability of variables in JavaScript, improving code quality, and preventing unintended side effects.
