Answers for "toString function js"

tostring javascript

num.toString();

what is tostring in js

toString . 
For user-defined Function objects, 
  the toString method returns a string containing the source text segment 
  which was used to define the function. JavaScript calls the toString method
  automatically when a Function is to be represented as a text value, 
    e.g. when a function is concatenated with a string.

js tostring

toString(123);