src/_filter/collection/unique.js
function some(array, member) {
        if(isUndefined(member)) {
          return false;
        }
        return array.some(function(el) {
          return equals(el, member);
        });
      }
function some(array, member) {
        if(isUndefined(member)) {
          return false;
        }
        return array.some(function(el) {
          return equals(el, member);
        });
      }
function some ( array , member ) { if ( isUndefined ( member ) ) { return false ; } return array . some ( function ( el ) { return equals ( el , member ) ; } ) ; }
checked if the unique identifier is already exist
checked if the unique identifier is already exist