Javascript implementation which beats 96%


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    /**
     * @param {number} x
     * @return {number}
     */
    var reverse = function(x) {
        let r = 0;
        while (x !== 0) {
            r = r * 10 +  x % 10;
            x = Math.trunc(x / 10);        
        }
        
        return Math.abs(r) >=  2147483648 ? 0 : r;
    };
    

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