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Hw 4 #4
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VladyslavMartynov
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Hw 4 #4
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<!DOCTYPE html> | ||
<html lang="en"> | ||
<head> | ||
<meta charset="UTF-8"> | ||
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | ||
<meta name="viewport" content="width=device-width, initial-scale=1.0"> | ||
<title>task4</title> | ||
</head> | ||
<body> | ||
<header></header> | ||
<main></main> | ||
<footer></footer> | ||
<script src="js/main.js" defer></script> | ||
</body> | ||
</html> |
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"use strict" | ||
// Написать функцию bindFunc, которая принимает в себя 2 + аргументов (Точно должна принять 2 аргумента, а дальше сколько угодно). | ||
// 1 аргумент - какая-то функция | ||
// 2 аргумент - значение контекста | ||
// 3 + ... аргументы - любое кол-во аргументов | ||
// Эта функция, должна устанавливать контекст для функции, которая в первом аргументе, и возвращать эту функцию с новым контекстом. | ||
// Сам контекст, который мы хотим установить, находиться во втором аргументе | ||
const bindFunc = (fn, context, ...args) => { | ||
return fn.apply(context, [...args]); | ||
} | ||
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const obj = { | ||
name: "Vlad", | ||
age: 32, | ||
} | ||
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function getAge(){ | ||
return this.age; | ||
} | ||
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const bindAge = bindFunc(getAge, obj); | ||
console.log(bindAge); | ||
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// Написать функцию, которая не принимает никаких аргументов. В теле функции написать логику для нахождения суммы значений любого количества ключей (значения ключей должны быть больше нуля) из переданного контекста. | ||
function sumKeys(){ | ||
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const obj = this; | ||
const valueObj = Object.values(obj); | ||
const filterObj = valueObj.filter(el => el != 0 && typeof el === 'number'); | ||
const sumObj = filterObj.reduce((acc, item) => acc + item); | ||
return sumObj; | ||
} | ||
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const objectA = { | ||
a: 1, | ||
b: 2, | ||
c: 3, | ||
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} | ||
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const sum = sumKeys.bind(objectA); | ||
console.log(sum()); | ||
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// Написать функцию, которая возвращает новый массив, в котором должны быть только четные числа, которые больше двуx и меньше 10. Новый массив будет состоять из значений ключа values из контекста, если такого ключа нет, то выводим сообщение "Не найдено". | ||
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function getNewArray(){ | ||
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. тут не нужен пробел |
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if(!this.values){ | ||
return `Не найдено`; | ||
} | ||
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const valueArr = this.values; | ||
const filterArr = valueArr.filter(el => { | ||
return typeof el === 'number' && el % 2 === 0; | ||
}); | ||
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const modifiedArr = filterArr.filter(el => { | ||
return el > 2 && el < 10; | ||
}); | ||
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const newArr = [...modifiedArr]; | ||
return newArr; | ||
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} | ||
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const valObject0 = { | ||
values: [1, '2', 4, 8, '8', 3, 10, null, false], | ||
}; | ||
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const result = getNewArray.bind(valObject0); | ||
console.log(result()); | ||
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Зачем эта константа?
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Понял , тут даже она не нужна!