src/helpers.js
function varType( v )
{
  const [ , type ] = Object.prototype.toString.call( v ).match(/\[object\s(\w+)\]/);

  return type;
}
function varType( v )
{
  const [ , type ] = Object.prototype.toString.call( v ).match(/\[object\s(\w+)\]/);

  return type;
}
function varType ( v ) { const [ , type ] = Object . prototype . toString . call ( v ) . match ( / \[object\s(\w+)\] / ) ; return type ; }
Get the data type of an argument.

@param  {*} v - Some variable
@return {string} Data type
Get the data type of an argument .