string.charAt(x) or string[x]?

Question

Is there any reason I should use string.charAt(x) instead of the bracket notation string[x]?

Answer 1

They can give different results in edge cases.

'hello'[NaN] // undefined
'hello'.charAt(NaN) // 'h'

'hello'[true] //undefined
'hello'.charAt(true) // 'e'

The charAt function depends on how the index is converted to a Number in the spec.