[Solved] How to tackle my JavaScript homework? [closed]

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You could transform your list of words by a list of their length with map() and sort them from the longest to the shortest then just keep the first :

var list = ["pain", "poire", "banane", "kiwi", "pomme", "raisin"]
var result = list.map(x => x.length).sort((a,b) => a < b)[0];
console.log(result);

Or if you don’t want to cop with a descendant sort you could keep a default sort but reverse the array like this :

var list = ["pain", "poire", "banane", "kiwi", "pomme", "raisin"]
var result = list.map(x => x.length).sort().reverse()[0];
console.log(result);

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solved How to tackle my JavaScript homework? [closed]