Node.js by Example: Constants

JavaScript supports constants of primitive values or references. They cannot be reassigned.

const declares a constant value.

 
const s = "constant";
const n = 5000000000;
console.log(s, n);

An object’s values within a constant can still be modified.

 
const obj = { foo: 1 };
obj.foo = 2;
console.log(obj);
 
$ node constant.js 
constant 5000000000
{ foo: 2 }

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