example

foo.js

cleanNum = _.chain("(123) 456-7890")
  .removeSpaces()
  .removeParens()
  .run(someOtherFuncWoMixin, p1, p2)  // good for time where you dont want to mixin to lodash/underscore
  .removeChar('-')
  .value()

  
// some utils file
  ...

removeSpaces = function(str) {
  return str.replace(/\s/g, '');
};

_.mixin({removeSpaces, removeParens, removeDashes});