In Javascript, how would you make a variable read-only?

Question

Utilisateur anonyme · Accepted Answer

declaring a variable using const keyword. This declares a read-only named constant

Marko Kovacevic · Answer

There are few solutions, one is to use revealing modular pattern where you return function that only retrieves value of property, and everything is wrapped in closure.  Other solution is to use Object.defineProperty where you cane be specific and set write value of object property.

ilya · Answer

create the variable using the var keyword, then create a function that returns its value

Before the `const` key word, freeze an object or define the object explicitly as read-only · Answer

var obj = {};

Object.freeze(obj);

// Or when defining a property
Object.defineProperty(obj, 'key', {
  writable: false,
  value: 'read-only variable'
});

Utilisateur anonyme · Answer

There is no "const" keyword back in 2013 when the question was asked.

Utilisateur anonyme · Answer

This looks so good:

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