javascript - Promise running both success and failure callbacks -


i have array of promises , it's running both pass , fail callbacks. can't figure out why. 

checkforlists: function() {     var listcheckpromise = [];      $.each(scmap.lists, function(i, list) {         listcheckpromise[i] = $().spservices({             operation: "getlist",         listname: list.name,         })     })      $.map(listcheckpromise, function(listpromise, index){         listpromise.then( pass(index), fail(index) )     })      function pass(index) {       var currentlist = scmap.lists[index]       console.log("pass:", currentlist.name, 'list created')     }      function fail(index) {       var currentlist = scmap.lists[index]       console.log("fail:", currentlist.name, 'does not exist. creating...')       scmap.createlist(currentlist)     } }

"... can't figure out why."

simple... because you're calling

$.map(listcheckpromise, function(listpromise, index){     listpromise.then(       pass(index), // <-- pass!       fail(index)) // <- , fail! })

you want try

$.map(listcheckpromise, function(listpromise, index){     listpromise.then(       function(){pass(index);},       function(){fail(index);}) })

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