Choosing the Right One

With five scope functions available, picking the right one comes down to two questions:

• How is the object referenced: this or it?
• What is returned: the lambda result or the object?

Here is the full picture:

• let uses it, returns lambda result.
• run uses this, returns lambda result.
• with uses this (arg), returns lambda result.
• apply uses this, returns object.
• also uses it, returns object.