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What Is Immutability?

What Is Immutability?

Learn the basics of immutability.

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Let’s define what the word mutation means. There are two types of variables in JavaScript: Those copied by value and those passed by reference. Primitive values such as numbers, strings, and Booleans are copied when you assign them to other variables, and a change to the target variable will not affect the source:

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Javascript (babel-node)
let string = "Hello";
let stringCopy = string;
stringCopy += " World!";
console.log(string); 
console.log(stringCopy);

In ...