Javascript does have it easier by virtue of being single threaded, with no overloading and with a single numeric type. In the python version of this loop:

Javascript does have it easier by virtue of being single threaded, with no overloading and with a single numeric type. In the python version of this loop: for x in range(1000): sum = sum + math.sin(x) The global "math" and "math.sin" can be changed by another thread at any point. Javascript guarantees that this cannot happen. Also, what constructs of Javascript are more dynamic than python? I can only think of "eval" and "with", both of which the JavaScript JIT decline to compile and interpret instead.