Return a potential undefined output

I am working with a variable called root which could potentially be undefined. Its value is only determined at runtime.

const root = resolvedRoot || await this.fileSystem.getCurrentUserHome();
console.log('root.uri = ' + root.uri);

The existence of the property root.uri is uncertain due to the nature of the above conditional logic.

Is there a method to securely and effectively display root.uri?

Answer №1

Always remember to verify if root is not undefined:

const root = resolvedRoot || await this.fileSystem.getCurrentUserHome();
if (root && root.uri) {
    console.log('root.uri = ' + root.uri);
}

By doing this, you ensure that root is present and defined, and if it is, then it must also have a uri property that is neither undefined nor null.

If root happens to be undefined or null, the second part of the condition won't be evaluated, so no issues there.

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