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index.js
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index.js
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////* *//
///* C O N S T R U C T O R *///
//* *////
function Array(length) {
if (arguments.length === 1) {
for (let i = 0; i < length; i++) {
this[i] = null;
}
this.length = length;
} else {
for (const arg of arguments) {
this[i] = arg;
}
this.length = arguments.length;
}
return this;
}
////* *//
///* I N S T A N C E M E T H O D S *///
//* *////
Array.prototype.push = function () {
for (const arg of arguments) this[Object.keys(this).length + i] = arg;
this.length += arguments.length;
};
Array.prototype.pop = function (item) {
delete this[Object.keys(this).length - 1];
this.length--;
};
Array.prototype.toString = function () {
return Object.keys(this)
.map((key) => (Number.isInteger(parseInt(key)) ? this[key] : ""))
.filter((string) => string)
.join(", ");
};
Array.prototype.concat = function () {
const array = this;
for (const arg of arguments) {
if (!Array.isArray(arg)) array.push(arg);
else for (const item of arg) array.push(item);
}
return array;
};
Array.prototype.copyWithin = function (target, start /*, end*/) {
if (this == null) {
throw new TypeError("this is null or not defined");
}
var O = Object(this);
var len = O.length >>> 0;
var relativeTarget = target >> 0;
var to =
relativeTarget < 0
? Math.max(len + relativeTarget, 0)
: Math.min(relativeTarget, len);
var relativeStart = start >> 0;
var from =
relativeStart < 0
? Math.max(len + relativeStart, 0)
: Math.min(relativeStart, len);
var end = arguments[2];
var relativeEnd = end === undefined ? len : end >> 0;
var final =
relativeEnd < 0
? Math.max(len + relativeEnd, 0)
: Math.min(relativeEnd, len);
var count = Math.min(final - from, len - to);
var direction = 1;
if (from < to && to < from + count) {
direction = -1;
from += count - 1;
to += count - 1;
}
while (count > 0) {
if (from in O) {
O[to] = O[from];
} else {
delete O[to];
}
from += direction;
to += direction;
count--;
}
return O;
};
////* *//
///* S T A T I C M E T H O D S *///
//* *////
Array.from = (function () {
var symbolIterator;
try {
symbolIterator = Symbol.iterator
? Symbol.iterator
: "Symbol(Symbol.iterator)";
} catch (e) {
symbolIterator = "Symbol(Symbol.iterator)";
}
var toStr = Object.prototype.toString;
var isCallable = function (fn) {
return typeof fn === "function" || toStr.call(fn) === "[object Function]";
};
var toInteger = function (value) {
var number = Number(value);
if (isNaN(number)) return 0;
if (number === 0 || !isFinite(number)) return number;
return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
};
var maxSafeInteger = Math.pow(2, 53) - 1;
var toLength = function (value) {
var len = toInteger(value);
return Math.min(Math.max(len, 0), maxSafeInteger);
};
var setGetItemHandler = function setGetItemHandler(isIterator, items) {
var iterator = isIterator && items[symbolIterator]();
return function getItem(k) {
return isIterator ? iterator.next() : items[k];
};
};
var getArray = function getArray(T, A, len, getItem, isIterator, mapFn) {
var k = 0;
while (k < len || isIterator) {
var item = getItem(k);
var kValue = isIterator ? item.value : item;
if (isIterator && item.done) {
return A;
} else {
if (mapFn) {
A[k] =
typeof T === "undefined"
? mapFn(kValue, k)
: mapFn.call(T, kValue, k);
} else {
A[k] = kValue;
}
}
k += 1;
}
if (isIterator) {
throw new TypeError(
"Array.from: provided arrayLike or iterator has length more then 2 ** 52 - 1"
);
} else {
A.length = len;
}
return A;
};
return function from(arrayLikeOrIterator /*, mapFn, thisArg */) {
var C = this;
var items = Object(arrayLikeOrIterator);
var isIterator = isCallable(items[symbolIterator]);
if (arrayLikeOrIterator == null && !isIterator) {
throw new TypeError(
"Array.from requires an array-like object or iterator - not null or undefined"
);
}
var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
var T;
if (typeof mapFn !== "undefined") {
if (!isCallable(mapFn)) {
throw new TypeError(
"Array.from: when provided, the second argument must be a function"
);
}
if (arguments.length > 2) {
T = arguments[2];
}
}
var len = toLength(items.length);
var A = isCallable(C) ? Object(new C(len)) : new Array(len);
return getArray(
T,
A,
len,
setGetItemHandler(isIterator, items),
isIterator,
mapFn
);
};
})();
Array.isArray = function (arg) {
return Object.prototype.toString.call(arg) === "[object Array]";
};
Array.of = function () {
const vals = [];
for (const prop in arguments) vals.push(arguments[prop]);
return vals;
};
const array = Array.of(10, "10", {});
console.log(array);