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3월, 2019의 게시물 표시

JS 6.6 task Sum with an arbitrary amount of brackets

<HTML> <body> </body> <script> function sum(a) { let currentSum = a; function f(b) { currentSum += b; return f; } f.toString = function() { return currentSum; }; return f; } alert( sum(1)(2) ); // 3 alert( sum(5)(-1)(2) ); // 6 alert( sum(6)(-1)(-2)(-3) ); // 0 alert( sum(0)(1)(2)(3)(4)(5) ); // 15 </script> </HTML>

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JS 6.6 task1 Set and decrease for counter

<HTML> <body> </body> <script> function makeCounter(){ let count = 0; function counter(input){ return count++; } counter.decrease = () => count--; counter.set = value => count = value; return counter; } let counter = makeCounter(); alert( counter() ); // 0 alert( counter() ); // 1 counter.set(10); // set the new count alert( counter() ); // 10 counter.decrease(); // decrease the count by 1 alert( counter() ); // 10 (instead of 11) </script> </HTML>

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JS 6.3 task Army of functions

<HTML> <body> </body> <script> function makeArmy() { let shooters = []; let i = 0; while (i < 10) { let j = i; // so that each array elements has separated //lexical environments which is generated by each run of while{}block let shooter = function() { // shooter function alert( j ); // should show its number }; shooters.push(shooter); i++; } return shooters; } let army = makeArmy(); army[0](); // the shooter number 0 shows 10 army[5](); // and number 5 also outputs 10... // ... all shooters show 10 instead of their 0, 1, 2, 3... </script> </HTML>

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JS 6.3 task Sort by field

<HTML> <body> </body> <script> let users = [ { name: "John", age: 20, surname: "Johnson" }, { name: "Pete", age: 18, surname: "Peterson" }, { name: "Ann", age: 19, surname: "Hathaway" } ]; //users.sort((a, b) => a.name > b.name ? 1 : -1); users.sort(byField('name')); users.sort(byField('name')); //users.sort((a, b) => a.age > b.age ? 1 : -1); function byField(field){ return (a, b) => a[field] > b[field] ? 1 : -1; } </script> </HTML> <!-- REMEMBER BITCHES THEY WORK THE SAME!!!!!!!!! alert(users[0]["name"]); alert(users[0].name); AND thanks for coming to my ted talk lol I feel apparently loosing every time when I open up solutions before I get my own answer. but cannot lie on that I love to see how the solution is clear, clever and better than mine remember AGAIN BITCHES THEY WORK T

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JS 6.3 task Filter through function

<HTML> <body> </body> <script> let arr = [1, 2, 3, 4, 5, 6, 7]; function inBetween(a, b) { return function(x) { return x >= a && x <= b; }; } alert( arr.filter(inBetween(3, 6)) ); // 3,4,5,6 function inArray(arr) { return function(x) { return arr.includes(x); }; } alert( arr.filter(inArray([1, 2, 10])) ); // 1,2 </script> </HTML> <!-- my solutions function inBetween(a, b){ let label = -1; return function(){ label++; if(arr[label] >= a && arr[label] <= b ) return true; }; } //where the fuck x comes from and how the hell anyone knows that is an iteral of array //yeah now i know how to use filter() better thats thw whole point //well yeah i could not think of the functino include absolutely my bad yes function inArray(inArr){ let count = 0; return function(x){ if(x == inArr[count] &&am

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JS 6.3 task4 Sum with closures

<HTML> <body> </body> <script> function sum(num1){ return function(num2){ return (num1 + num2); } } alert( sum(1)(2) ); // 3 alert( sum(5)(-1) ); // 4 // alert("working fine"); </script> </HTML>

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JS 5.11 task2 Exclude backreferences

<HTML> <body> </body> <script> let room = { number: 23 }; let meetup = { title: "Conference", occupiedBy: [{name: "John"}, {name: "Alice"}], place: room }; // circular references room.occupiedBy = meetup; meetup.self = meetup; alert( JSON.stringify(meetup, function replacer(key, value) { alert(`${key}: ${value}`); return (key != "" && value == meetup) ? undefined : value; })); /* result should be: { "title":"Conference", "occupiedBy":[{"name":"John"},{"name":"Alice"}], "place":{"number":23} } */ </script> </HTML>

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JS 5.11 task1 Turn the object into JSON and back

<HTML> <body> </body> <script> let user = { name: "John Smith", age: 35 }; let stringified =JSON.stringify(user); // alert(stringified); let parsed = JSON.parse(stringified); // alert(parsed.name); // alert(parsed.age); </script> </HTML>

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JS 5.10 task7 How many seconds till tomorrow?

<HTML> <body> </body> <script> function getSecondsToTomorrow(){ let stamp = new Date(); let date = new Date(stamp.getFullYear(), stamp.getMonth(), stamp.getDate() + 1); let diff = date.getTime() - stamp.getTime(); return Math.round(diff / 1000); // making seconds //getTime returns miliseconds } alert(getSecondsToTomorrow()); </script> </HTML>

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JS 5.10 task6 How many seconds has passed today?

<HTML> <body> </body> <script> function getSecondsToday(){ let stamp = new Date(); let date = new Date(stamp.getFullYear(), stamp.getMonth(), stamp.getDate()); //following two lines are from solution let diff = stamp.getTime() - date.getTime(); return Math.round(diff / 1000); // making seconds //getTime returns miliseconds } alert(getSecondsToday()); </script> </HTML>

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JS 5.10 task5 Last day of month?

<HTML> <body> </body> <Script> function getLastDayOfMonth(year, month){ let date = new Date(year, month + 1, 0); return date.getDate(); //putting 0 on day roll back the month //and set the date to be the last date of the month } alert(getLastDayOfMonth(2012, 1)); </Script> </HTML>

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JS 5.10 task4 which day of month was many days ago?

<HTML> <body> </body> <Script> function getDateAgo(date, num){ let dateSet = new Date(date); dateSet.setDate(dateSet.getDate() - num); return dateSet; } let date = new Date(2015, 0, 2);// 2 jan alert( getDateAgo(date, 1) ); // 1, (1 Jan 2015) alert( getDateAgo(date, 2) ); // 31, (31 Dec 2014) alert( getDateAgo(date, 365) ); // 2, (2 Jan 2014) </Script> </HTML>

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JS 5.10 task3 European weekday

<HTML> <body> </body> <Script> function getLocalDay(date){ let day = date.getDay(); if(day == 0){ day = 7; } return day; } let date = new Date(2012, 0, 3); // 3 Jan 2012 alert( getLocalDay(date) ); // tuesday, should show 2  </Script> </HTML>

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JS 5.10 task2

<HTML> <body> </body> <Script> function getWeekDay(dateObj){ let day = ['SU','MO','TU','WE','TH','FR','SA']; return day[dateObj.getDay()]; } let date = new Date(2012, 0, 3); // 3 Jan 2012 alert( getWeekDay(date) ); </Script> </HTML>

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JS 5.10 task1

<HTML> <body> </body> <Script> let date = new Date(2012,1,2,03,12); alert(date); </Script> </HTML>

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JS 5.9 task2 The maximal salary

<HTML> <body> </body> <Script> let salaries = { "John": 100, "Pete": 300, "Mary": 250 }; function topSalary(obj){ let max = 0; let maxName = null; for(const [name, sal] of Object.entries(obj)){ if(max < sal){ max = sal; maxName = name; } } return maxName; } alert(topSalary(salaries)); </Script> </HTML>

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JS 5.9 task1 Destructuring Assignment

<HTML> <body> </body> <Script> let user = { name: "John", years: 30 }; let {name, years:age, isAdmin = false} = user; alert( name ); // John alert( age ); // 30 alert( isAdmin ); // false </Script> </HTML>

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JS 5.8 task2 Count properties

<HTML> <body> </body> <script> let user = { name: 'John', age: 30 }; function count(obj){ return Object.entries(obj).length; } alert( count(user) ); // 2 </script> </HTML>

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JS 5.8 task1 Sum the properties

<HTML> <body> </body> <script> let salaries = { "John": 100, "Pete": 300, "Mary": 250 }; function sumSalaries(obj){ let target = Object.values(obj); let sum = 0; for(let salary of target){ sum = sum + salary; } return sum; } alert( sumSalaries(salaries) ); // 650 </script> </HTML>

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JS 5.7 task5 Store read dates

<HTML> <body> </body> <script> let messages = [ {text: "Hello", from: "John"}, {text: "How goes?", from: "John"}, {text: "See you soon", from: "Alice"} ]; let readMap = new WeakMap(); alert(readMap.size); readMap.set(messages[0], new Date(2019, 3, 5)); </script> </HTML>

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JS 5.7 task 2 Filter anagrams

<HTML> <body> </body> <script> function aclean(arr){ let map = new Map(); for(let word of arr){ let sorted = word .toLowerCase() // delete the case difference .split('') //split it to sort .sort() // sort it to delete the order difference .join(''); // join to use as a key = one word map.set(sorted, word); //set saves keys by the key not by the value, //the words canoot be saved when word with the same //key is saved already //map = is a collection of keyed value //set = is a colelction of unique value } return Array.from(map.values()); } let arr = ["nap", "teachers", "cheaters", "PAN", "ear", "era", "hectares"]; alert( aclean(arr) ); </script> </HTML> <!-- could not actually solve it but the solution logic was in

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JS 5.7 task3 Iterable keys

<HTML> <body> </body> <script> let map = new Map(); map.set("name", "John"); let keys = Array.from(map.keys()); // Error: keys.push is not a function keys.push("more"); alert(keys); </script> </HTML>

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