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@@ -0,0 +1,100 @@
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+//sort
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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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+// function sort(persons, name, boolean) {
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+// if (boolean === true || boolean == null) {
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+// for (let i = 0; i < persons.length; i++) {
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+// for (let k = 0; k < persons.length - 1; k++) {
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+// if (persons[k][name] > persons[k + 1][name]) {
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+// let c = persons[k];
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+// persons[k] = persons[k + 1];
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+// persons[k + 1] = c;
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+// }
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+// }
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+// }
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+// } else {
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+// for (let i = 0; i < persons.length; i++) {
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+// for (let k = 0; k < persons.length - 1; k++) {
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+// if (persons[k][name] < persons[k + 1][name]) {
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+// let c = persons[k];
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+// persons[k] = persons[k + 1];
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+// persons[k + 1] = c;
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+// }
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+// }
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+// }
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+// }
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+// }
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+// sort(persons, "age");
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+// console.log(persons);
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+// sort(persons, "name",false);
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+// console.log(persons);
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+
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+
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+//array Map
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+
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+// arr = ["1", {}, null, undefined, "500", 700];
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+// let result = arr.map(function(item,index,arr){
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+// var numbers = parseInt(item);
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+// return isNaN(numbers) ? item : numbers;
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+// })
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+
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+//array reduce
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+// arr = ["0", 5, 3, "string", null]
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+// let result = arr.reduce(function(accumulator, currentValue){
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+// if (typeof(currentValue) == 'number'){
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+// accumulator *= currentValue
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+// }
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+// return accumulators;
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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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+// 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(arr,f){
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+// let result = []
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+// for (let item in arr){
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+// if(f(item,arr[item])){
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+// result[item] = arr[item]
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+// }
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+// }
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+// console.log(result)
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+// }
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+// filter(phone,(key,value) => key == "color" || value == 2);
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+
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+// object map
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+
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+// function map(obj,callback){
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+// for(let key in obj){
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+// var obj1 = callback(key,obj[key]);
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+// delete obj[key]
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+// for (key in obj1)
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+// obj[key] = obj1[key]
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+// return obj
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+// }
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+// }
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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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+// console.log(obj)
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+
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+
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+// Sum
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+function sumRec(a){
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+ if (a > 1){
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+ return a + sumRec(a-1)}
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+ return 1;
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+ }
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+ console.log(sumRec(3))
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Andrey
3 年 前