@putout/plugin-convert-optional-to-logical

@putout/plugin-convert-optional-to-logical

The optional chaining operator (?.) enables you to read the value of a property located deep within a chain of connected objects without having to check that each reference in the chain is valid.

The ?. operator is like the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined. When used with function calls, it returns undefined if the given function does not exist.

This results in shorter and simpler expressions when accessing chained properties when the possibility exists that a reference may be missing. It can also be helpful while exploring the content of an object when there's no known guarantee as to which properties are required.

(c) MDN

The logical AND (&&) (logical conjunction) operator for a set of boolean operands will be true if and only if all the operands are true. Otherwise it will be false.

More generally, the operator returns the value of the first falsy operand encountered when evaluating from left to right, or the value of the last operand if they are all truthy.

(c) MDN

🐊Putout plugin adds ability to convert Optioncal Chaining to Logical Expression. Like apply-optional-chaining but backwards.

Install

npm i @putout/plugin-convert-optional-to-logical

Configuration

{
    "rules": {
        "convert-optional-to-logical/assign": "on",
        "convert-optional-to-logical/call": "on"
    }
}

assign

The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be triggered when a single = sign was used instead of == or ===.

(c) MDN

Checkout in 🐊Putout Editor.

❌ Example of incorrect code

maybeAnObj?.prop = theValue;

✅ Example of correct code

maybeAnObj && (maybeAnObj.prop = theValue);

call

Disabled by default. Checkout in 🐊Putout Editor.

❌ Example of incorrect code

hello?.world?.();

✅ Example of correct code

hello && hello.world && hello.world();

License

MIT