Why can't arrays be compared with === in Javascript? -

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this question has answer here:

why isn't code correctly pushing words answer array? when change loop to:

    (var k in testdict) {         console.log(testdict[k].split("").sort());     }

it correctly prints i'm expecting, array of split, sorted characters words. i'm not sure why it's not evaluating equal , pushing answer. thanks!

function word_unscrambler(word, dict) {     var testdict = dict;     var answer = [];     var word_scrambled = word.split("").sort();         (var k in testdict) {             if (word_scrambled === testdict[k].split("").sort())                 answer.push(testdict[k]);         }     console.log(answer); }  word_unscrambler("kevin", ["trees", "but", "ankle", "nevik", "knive", "evin"]);

the problem testing arrays equality, since working strings, can join both arrays being compared:

function word_unscrambler(word, dict) {     var testdict = dict;     var answer = [];     var word_scrambled = word.split("").sort().join('');         (var k in testdict) {             if (word_scrambled === testdict[k].split("").sort().join(''))                 answer.push(testdict[k]);         }     console.log(answer); }

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