text: const S = require('sanctuary')
  const $ = require('sanctuary-def')
  
  /*
  is
  If the given value is a member of the specified type returns true, otherwise false.
  */
  
  console.log(S.is($.String)('Sanctuary')) // true
  console.log(S.is($.Number)('Sanctuary')) // false
  console.log(S.is($.Array($.Integer))([1, 2, 3])) // true
  console.log(S.is($.Array($.Integer))(['hello', 'world'])) // false
  console.log(S.is($.Array($.Array($.Integer)))([[1], [1, 2], [3, 4]])) // true
  