if (!(<any>Array.prototype).fill) {

(<any>Array.prototype).fill = function(value) {

let O = Object(this);

let len = parseInt(O.length, 10);

let start = arguments[1];

let relativeStart = parseInt(start, 10) || 0;

let k = relativeStart < 0

? Math.max( len + relativeStart, 0)

: Math.min( relativeStart, len );

let end = arguments[2];

let relativeEnd = end === undefined

? len

: (parseInt(end, 10) || 0) ;

let final = relativeEnd < 0

? Math.max(len + relativeEnd, 0)

: Math.min(relativeEnd, len);

for (; k < final; k++) {

O[k] = value;

}

return O;

};

}

if (!(<any>Array).from) {

(<any>Array).from = function(iterable, mapFn, thisArg) {

let results: Array<any> = [];

if (iterable.next) {

// Iterator objects

for (let step = null; ; step = iterable.next()) {

if (step.done) {

break;

} else {

results.push(step.value);

}

}

} else {

// Array-like objects

results = [].slice.call(iterable);

}

if (mapFn) {

results = <Array<any>><any>results.forEach(mapFn, thisArg);

}

return results;

};

}