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@@ -0,0 +1,130 @@
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+// //cube
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+// let cube = n => n*n*n
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+// alert(cube(10))
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+
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+// //avg2
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+// let avg2 = (a,b) => (a+b)/2
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+// alert (avg2 (10,7))
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+
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+// //sum3
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+// let sum3 = (a,b,c) => {
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+// a = a || 0;
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+// b = b || 0;
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+// c = c || 0;
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+// var result = a+b+c
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+// alert (result)
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+// }
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+
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+// sum3(10,5,17)
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+// sum3(10,5)
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+
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+// //intrandom
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+// let intRandom = (low,high) =>Math.round(Math.random()*((high || 0) - (low ||0)) + (low || 0))
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+// alert(intRandom(10,5))
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+
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+// //greetAll
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+
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+// let greetAll = (arguments) => {
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+// let str = " "
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+// for (let i = 0;i < arguments.length;i++){
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+// str += arguments[i]
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+// }
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+// str.slice(0 , -1)
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+// alert ("Hello" + "," + str)
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+// }
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+// greetAll("SuperMan")
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+
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+// //sum (//nerabotaet)
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+
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+// let sum = (arguments) =>{
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+// var result = 0;
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+// for (var i = 0;i <arguments.length; i++){
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+// result += arguments[i]}
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+// }
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+
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+// alert(sum(1,5,6,7,10))
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+
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+//sort
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+let 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(field, boolean = true) {
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+ if (boolean) {
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+ return (a, b) => a[field] > b[field] ? 1 : -1
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+ }else {
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+ return (a, b) => a[field] < b[field] ? 1 : -1
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+ }
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+}
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+
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+console.log(persons.sort(sort('age', false)))
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+
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+
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+//arr.map
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+let arr = ["1", {}, null, undefined, "500", 700];
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+
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+let newArr = arr.map(function(a){
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+ return typeof(a) === 'string' ? parseInt(a) : a;
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+});
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+
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+console.log(arr);
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+console.log(newArr);
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+
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+//arr.reduce
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+var arr = ["0", 5, 3, "string", null]
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+var result = arr.reduce(function(previousValue, currentValue){
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+if(typeof(currentValue)==='number'){
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+previousValue*=currentValue;
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+};
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+return previousValue
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+ }, 1)
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+ alert(result);
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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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+
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+function filter (object , name ,value) {
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+ let result = {}
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+ for (key in object) {
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+ if (name == key || object[key] == value){
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+ result[key] = object [key]
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+ }
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+ }
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+ return result
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+}
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+console.log (filter(phone,'color',2))
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+
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+//object map
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+let obj = map({name: "Иван", age: 17},function(key,value){
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+ var 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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+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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+ }
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+ return obj
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+}
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+
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+console.log(obj);
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+
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+//рекурсия (считает сумму до какого-то числа)
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+function sumTo(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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+
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+ alert( sumTo(10) );
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+
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Vadym Hlushko