add arr.sort
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@ -34,4 +34,18 @@ console.log(someUsers);
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// arr.map(fn)
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let lengths = array.map(item=>item.length);
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alert(lengths);
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console.log(lengths);
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// arr.sort(fn)
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function compare(a, b){
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if (a > b) return 1;
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if (a == b) return 0;
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if (a < b) return -1;
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}
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arr = [15, 2 ,1];
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console.log(`arr.sort(): ${arr.sort(compare)}`);
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console.log(`arr.sort(): ${arr.sort((a,b) => a - b)}`);
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let countries = ['Österreich', 'Andorra', 'Vietnam'];
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console.log(countries.sort((a,b) => a.localeCompare(b)))
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