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@@ -0,0 +1,130 @@
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+// ES6
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+// a
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+let a = text => alert(text);
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+
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+// cube
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+let cube = (a) => a * a * a;
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+
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+// avg2
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+let avg2 = (a, b) => (a + b) / 2;
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+
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+// sum3
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+let sum3 = (a = 0, b = 0, c = 0) => a + b + c;
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+
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+// intRandom
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+let intRandom = (a = 0, b = 0) => Math.round(Math.random() * (b - a)) + a;
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+
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+// greetAll
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+let greetAll = (...arguments) => {
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+ for (let i in arguments) {
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+ alert('"' + 'Hello' + ' ' + arguments[i] + '"');
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+ }
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+}
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+
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+// sum
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+let sum = (...arguments) => {
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+ let sum = 0;
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+ for (let i = 0; i < arguments.length;i++) {
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+ sum += arguments[i];
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+ }
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+ return sum;
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+}
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+
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+// sort
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+function byField(field, order) {
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+ let collator = new Intl.Collator(["en", "ru"], {
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+ numeric: true
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+ })
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+ order = order ? 1 : -1;
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+ return function(a, b) {
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+ return order * collator.compare(a[field], b[field]);
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+ }
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+}
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+
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+let users = [{
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+ name: "Иван",
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+ age: 17,
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+}, {
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+ name: "Мария",
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+ age: 35,
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+}, {
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+ name: "Алексей",
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+ age: 73,
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+}, {
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+ name: "Яков",
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+ age: 12,
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+}]
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+
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+users.sort(byField('age', true)); //сортирует по возрасту по возрастанию
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+users.sort(byField('name', true)); //сортирует по имени по убыванию
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+
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+// array map
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+let Array = ["1", {}, null, undefined, "500", 700];
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+
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+let result = Array.map(function(item) {
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+ let number = parseInt(item);
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+ return isNaN(number)? item : number;
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+})
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+
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+console.log(result);
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+
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+// array reduce
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+let arr = ["0", 5, 3, "string", null];
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+let result = arr.reduce(function(previousValue, currentValue) {
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+return typeof currentValue == 'number' ? previousValue * currentValue : previousValue;
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+},1);
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+console.log(result);
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+
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+// object filter
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+function filter(obj, callback) {
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+ let mainObj = {};
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+ for(let key in obj) {
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+ if (callback(key, obj[key])) {
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+ mainObj[key] = obj[key];
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+ }
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+ }
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+ return mainObj;
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+ }
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+
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+ let phone = {
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+ brand: "meizu",
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+ model: "m2",
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+ ram: 2,
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+ color: "black",
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+ }
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+
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+let outcome = filter(phone,(key,value) => key == "color" || value == 2);
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+console.log(outcome);
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+
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+// object map
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+function map(object, callback) {
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+ let obj = {};
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+ for(let key in object)
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+ Object.assign(obj,callback(key, object[key]));
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+ return obj;
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+ }
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+ let obj = map({name: 'Иван', age: 17}, function(key, value) {
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+ let result = {};
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+ result[key+"_"] = value + "$";
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+ return result;
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+ })
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+
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+console.log(obj);
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+//возвращает {name_: "Иван$", age_: "17$"}
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+
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+// Sum
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+// pешение с помощью цикла
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+function sum(n) {
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+ let sum = 0;
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+ for (let i = 1;i <= n;i++) {
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+ sum += i;
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+ }
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+ return sum;
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+}
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+
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+// or
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+// pешение через рекурсию
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+function sum(n) {
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+ if (n == 1) return 1;
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+ return n + sumTo(n - 1);
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+}
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Евгения Акиншина