I am trying to solve this exercise but really it seems impossible.

Write a Javascript function that, given a string and a dictionary of words, determines whether all the words of the dictionary (and only those words) are contained in the string.

Forbidden functions:

String.prototype.indexOf()

String.prototype.charAt()

String.prototype.endsWith()

String.prototype.startWith()

String.prototype.includes()

String.prototype.match()

String.prototype.lastindexOf()

String.prototype.search()

String.prototype.replace()

String.prototype.substring()



EXAMPLE OF GOOD PROVIDER:

string: 'foobarfooba'

dictionary: 'foo', 'bar', 'fooba'



string: 'foobarfoobarbarfooba'

dictionary: 'foo' 'bar' 'fooba'



EXAMPLE OF BAD PROVIDER:

string: 'foobarfoobas'

dictionary: 'foo', 'bar', 'fooba'



string: 'foobarfooba';

dictionary: 'foo', 'bar'