Array type in type script

Question

Why is this allowed by TypeScript? I specified a numeric index. Why can I use a string as an index? Visual studio doesn\'t report an error.

interface StringA         


        

Answer 1

An array is also an objects. So you can access the object properties.

var array = [];
array.push("One"); // array
array[1]= "Two"; // array
array['key'] = "Three";// object
array.key2 = "Four"; // object
var length = array.length; // Is 2