I just bumped into this. Anyone have insight as to why this works?
const a = {b: 2};
console.log( a[['b']] );
// Result: 2
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Index(es) needs to be string and JS will automatically convert anything used as object's index to a string.
['b'].toString()happens to be equal to 'b' (its same as['b'].join(',')).Looks like it.
not sure if that's related but [['b']] appears to be equal to 'b'