Today while coding, I came across something puzzling.
arguments.concat(someNumber);
This line gave me an error for undefined function. Initially, I assumed that arguments was a native object for optimization purposes, but later discovered it's simply a plain javascript object and not an array or internal native object. This left me pondering if there is a specific reason behind this design choice.
The arguments object stands out as unique in Harmony's terminology, being considered "exotic" due to its ability to maintain a live connection between its numeric properties and scope variables:
function x(a) {
arguments[0] = 42;
document.write(a);
}
x(10)In order to enable this feature, arguments must override a significant amount of default object functionality. This is why it is classified as a separate type.
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