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Oct 16th, 2018
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  1. function containsAll(haystack, ...needles) {
  2. for (var needle of needles) {
  3. if (haystack.indexOf(needle) === -1) {
  4. return false;
  5. }
  6. }
  7. return true;
  8. }
  9.  
  10. containsAll("banana", "b", "nan")
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