JavaScript object property names can be any string, including having spaces in the name. However, object property names that are not valid JavaScript identifiers, can only be:
- Specified using quotes, and;
- Accessed using the bracket property accessor notation.
For example, the following is a valid property name:
const obj = { 'Foo Bar': 123 };
console.log(obj['Foo Bar']); // 123
You can even have spaces at start or the end of the property name:
const obj = { ' Foo Bar ': 123 };
console.log(obj[' Foo Bar ']); // 123
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