Factory & Constructor Functions

Which approach demonstrates a safer constructor function implementation?

// Option A:
function User(name) {
  if (!(this instanceof User)) {
    return new User(name);
  }
  this.name = name;
}

// Option B:
function User(name) {
  this.name = name;
}

Option B because it's simpler
Option B because it uses less memory
Option A because it handles missing 'new' keyword
Option A is safer because it checks if the function was called without 'new' and automatically creates a new instance if needed. This prevents the common error of accidentally calling a constructor function without 'new', which would otherwise cause 'this' to reference the global object. This pattern is known as a 'self-instantiating constructor'.
Both are equally safe

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