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find longest substring in string
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| function find2(str) { | |
| let _helper = []; | |
| return str | |
| .split('') | |
| .reduce((acum, item, i, originalArr) => { | |
| if (_helper.some(char => char === item)) { | |
| acum.push(_helper); | |
| _helper = []; | |
| } | |
| _helper.push(item); | |
| if (i === originalArr.length - 1) { | |
| acum.push(_helper); | |
| } | |
| return acum; | |
| }, []) | |
| .map(x => x.join('')) | |
| .reduce( | |
| (a, b) => (a.length > b.length ? a : b), | |
| '', | |
| ); | |
| } | |
| console.log(find2('abcdcfepoi')); // cfepoi | |
| console.log(find2('dertyuioplkjhgfdqwe')); // dertyuioplkjhgf | |
| console.log(find2('')); // '' |
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