Using constants as indices for JavaScript associative arrays

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In ECMAScript 6 you can use computed values for object keys:

var CONSTANT_A = 0, CONSTANT_B = 1
var state_machine = {
    [CONSTANT_A]: function () {
        return 'a'
    },
    [CONSTANT_B]: function () {
        return 'b'
    }
};

console.log(state_machine)

This does not work in Internet Explorer 11 nor in Safari browsers:
https://kangax.github.io/compat-table/es6/#test-object_literal_extensions_computed_properties

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