What exactly is Type Coercion in Javascript?

Question

What exactly is type coercion in Javascript?

For example, on the use of == instead of ===?

Answer 1

In Python if you try to add, say, strings and integers, you get an error:

>>> "hi" + 10
Traceback (most recent call last):
  File "", line 1, in 
TypeError: cannot concatenate 'str' and 'int' objects

Yet in JavaScript, you don't. The 10 gets converted to a string:

> "hi" + 10
"hi10"

"Type coercion" is just a fancy misnomer for the above. In actuality, neither language has "types" in the sense of Java or C or other languages with static type systems. How the languages treat interactions between the various non-statically-typed values is a matter of choice and convention.