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@@ -0,0 +1,68 @@
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+/* Сортировка */
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+
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+var persons = [
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+ {name: "Иван", age: 17},
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+ {name: "Мария", age: 35},
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+ {name: "Алексей", age: 73},
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+ {name: "Яков", age: 12},
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+]
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+
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+function sort(array, field, order = true) {
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+ let arrSorted = array.sort(function (a, b){
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+ if (a[field] > b[field]) {
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+ return order ? 1 : -1;
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+ }
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+ else{
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+ return order ? -1 : 1;
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+ }
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+ })
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+ return arrSorted
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+
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+}
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+
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+sort(persons, 'age', false)
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+
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+/* array map */
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+
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+let arr = ["1", {}, null, undefined, "500", 700]
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+let arr1 = arr.map(x => typeof x === 'string' ? +x : x)
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+console.log(arr1)
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+
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+/* array reduce */
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+
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+let arr2 = ["0", 5, 3, "string", null];
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+let arr3 = arr2.filter(x => typeof x === 'number').reduce((a, b) => a *= b)
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+console.log(arr3)
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+
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+/* object filter */
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+
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+var 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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+filter(phone, (key, value) => key == "color" || value == 2);
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+
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+function filter(obj, key, value) {
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+ let object = {}
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+ for(let key in obj) {
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+ for(let value in obj) {
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+ if (obj[key] == 2 && value == "color") {
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+ object[key] = obj[key]
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+ object[value] = obj[value]
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+ }
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+ }
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+ }
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+ return object
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+ }
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+
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+/* Рекурсия: sum */
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+
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+function progression(n) {
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+ if (n === 0) {
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+ return 0
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+ } else {
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+ return n + progression(n - 1)
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+ }
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+}
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