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  1. Lonely Integer
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Lonely Integer

  • EhsanAsh
     + 0 comments

    in JavaScript:

    function lonelyinteger(a) {
    const numOfIncidents = a.reduce((obj, int) => {
        obj[int] = (obj[int] || 0) + 1;
        return obj;
    }, {});
    
    for (let key in  numOfIncidents) {
         if (numOfIncidents[key] === 1){
             return parseInt(key);
         }
     }
 }