Javascript for loop not appending list in dictionary -

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and i'm not sure understand problem @ all. 

var vtf=[]; // dictionary maps number-> list var length; var s; // list of numbers s.length = length // length , s set values  for(i=0; i<length; i++) {     var f=s[i];      if(f in vtf)        vtf[f].push(i);     else        vtf[f]=[i]; }

so check if vtf contains value f=s[i]. if appends list contained @ vtf[f] , if doesn't makes new list element.

the problem after running every index of vtf contains first added despite me knowing every value saved in vtf should have list of multiple elements.

i can't understand i'm doing wrong. when put alerts inside if statement don't pop when put them outside loop, same value, show it's evaluating true number of times.


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