Can JavaScript Object Property Name Have Underscores?

JavaScript object property names can be any string, including having underscores in the name. In fact, underscores are valid identifiers, which means that:

For example, the following is a valid property name:

const obj = { foo_bar: 'baz' };

console.log(obj.foo_bar); // 'baz'
console.log(obj['foo_bar']); // 'baz'

You can even have underscores at start or the end of the property name:

const obj = { _foo_: 'bar' };

console.log(obj._foo_); // 'bar'
console.log(obj['_foo_']); // 'bar'

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