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1
915
 
 
 
915
915
915
2
 
913
913
913
913
 
 
 
 
913
913
60005
60005
 
612
 
59393
 
301
 
 
 
Array.prototype.includes = function includes(searchElement) {
    Iif (this == null) {
        throw new TypeError('Array.prototype.includes called on null or undefined');
    }
 
    let O = Object(this);
    let len = parseInt(O.length, 10) || 0;
    if (len === 0) {
        return false;
    }
    let n = parseInt(arguments[1], 10) || 0;
    let k;
    Eif (n >= 0) {
        k = n;
    } else {
        k = len + n;
        if (k < 0) { k = 0; }
    }
    let currentElement;
    while (k < len) {
        currentElement = O[k];
        if (searchElement === currentElement ||
     (searchElement !== searchElement && currentElement !== currentElement)) { // NaN !== NaN
            return true;
        }
        k++;
    }
    return false;
};