Why does for(var i in Math) not iterate through Math.* in Javascript?

Question

For some reason for(var i in Math){console.log(i)} doesn\'t show the expected tan, cos, atan2, E, PI in Javascript.

Answer 1

I keep noticing when the actual method is not known people will tell you you shoud'nt do it

The following is the way to expose private functions of a given object

let exposeFunctionsOf  =(obj) =>
{
    let iterated = false
    for ( let k in obj ) 
    {
        iterated = true;
        let prop = obj[k]
        if ( typeof props == "function")
        {
            window[k] = prop
        }
    }
    if (!iterated)
    {
       let props_names = Object.getOwnPropertyNames(obj);
       for (let prop_name of props_names)
       {
          iterated = true;
          let prop = obj[prop_name]
          if ( typeof prop == "function")
            window[prop_name] =prop
       }
    }
    if (!iterated)
    {
      console.warn("failed to iterate through the following object")
      cosnole.log(obj)
    }
}

Applied on Math object

exposeFunctionsOf(Math)

Now you can write sin(x) instead of Math.sin(x)

Enjoy