Question

What would be a nice algorithm to remove dupes on an array like below…

    var allwords = [      ['3-hidroxitiramina', '3-hidroxitiramina'],      ['3-hidroxitiramina', '3-hidroxitiramina'],      ['3-in-1 block', 'bloqueo 3 en 1'],      ['abacterial', 'abacteriano'],      ['abacteriano', 'abacteriano'],      ['abciximab', 'abciximab'],  ... 

Just to clarify, I would want one of the

['3-hidroxitiramina', '3-hidroxitiramina'], 

To be removed, so there is just one

Answer 1

[edit]: misread, after reading your clarification I’d suggest:

 var i = allwords.length-1, prev='';  do {      if (allwords[i].join('/') === prev) {         allwords.splice(i,1);      }      prev = allwords[i].join('/');  } while (i-- && i>-1); 

(reversing the loop is a optimization step)