const uniqueWithSum = arr =>
arr.reduce((acc, n) => {
const keys = n.slice(0, -1);
const item = acc.find(m => m.length === n.length && keys.every((k, i) => k === m[i]));
(item ?? (acc[acc.length] = [ ...keys, 0 ]))[keys.length] += n[keys.length];
return acc;
}, []);const uniqueWithSum = (function(arr) {
const indexTree = new Map;
return arr.reduce((acc, [...keys]) => {
const val = keys.pop();
const indexes = keys.reduce((p, c) => p.set(c, p.get(c) ?? new Map).get(c), indexTree);
const index = indexes.set(this, indexes.get(this) ?? ~-acc.push([ ...keys, 0 ])).get(this);
acc[index][keys.length] += val;
return acc;
}, []);
}).bind(Symbol());const uniqueWithSum = arr =>
[...arr.reduce((acc, n) => {
const end = n.length - 1;
const key = n.reduce((p, c, i) => i === end ? p : p.set(c, p.get(c) ?? new Map).get(c), acc[0]);
acc[1].set(key, acc[1].get(key) ?? n.map((m, i) => i !== end && m)).get(key)[end] += n[end];
return acc;
}, [ new Map, new Map ])[1].values()];const replaceKeys = (value, replacer) =>
value instanceof Object
? value instanceof Array
? value.map(n => replaceKeys(n, replacer))
: Object.fromEntries(Object
.entries(value)
.map(n => [ replacer(n[0]), replaceKeys(n[1], replacer) ])
)
: value;
const newObj = replaceKeys(obj, k => `${k}_upd`);function replaceKeys(value, replacer) {
const stack = [];
const clones = new Map;
const getClone = val => val instanceof Object
? (clones.has(val) || stack.push([ val, clones.set(val, val.constructor()).get(val) ]),
clones.get(val))
: val;
for (getClone(value); stack.length;) {
const [ source, target ] = stack.pop();
const isArray = Array.isArray(source);
for (const k in source) if (Object.hasOwn(source, k)) {
target[isArray ? k : replacer(k)] = getClone(source[k]);
}
}
return getClone(value);
}const regex = /#[a-f\d]+;$/i;
const replacement = '<span class="color" style="background: $&"></span>';
document.querySelectorAll('селектор сами сообразите').forEach(n => {
n.innerHTML = n.innerText.replace(regex, replacement);
});const result = arr.reduce((acc, n, i, a) => (
n === a[i - 1] + 1 || acc.push([]),
acc.at(-1).push(n),
acc
), []);function groupAdjacent(
data,
{
key = n => n,
newGroup = (c, p) => c !== p,
} = {}
) {
const result = [];
const getVal = key instanceof Function ? key : n => n[key];
let prev = null;
let i = -1;
for (const n of data) {
const curr = getVal(n, ++i);
if (!result.length || newGroup(curr, prev)) {
result.push([]);
}
result.at(-1).push(n);
prev = curr;
}
return result;
}const result = groupAdjacent(arr, { newGroup: (c, p) => c !== -~p });
// или
const result = groupAdjacent(arr, { key: (n, i) => n - i });.product. Вместо первого .product нужен тот, внутри которого находится нажатая кнопка:document.querySelector('.wrapper_product') ---> event.target
menu.addEventListener('click', ({ target: t }) => {
if (t.tagName === 'SPAN') {
const parent = t.parentNode;
parent.classList.toggle('active');
for (const n of menu.querySelectorAll('.active')) {
if (n !== parent) {
n.classList.toggle('active', n.contains(parent));
}
}
}
});- .menu_list_item.active .submenu {
+ .active > .submenu {- .submenu_list_item.active .product {
+ .active > .product {const container = document.querySelector('#menu');
const itemSelector = 'li';
const buttonSelector = `${itemSelector} span`;
const activeClass = 'active';
container.addEventListener('click', function(e) {
const item = e.target.closest(buttonSelector)?.closest(itemSelector);
if (item) {
item.classList.toggle(activeClass);
this.querySelectorAll(`.${activeClass}`).forEach(n => {
if (n !== item) {
n.classList.toggle(activeClass, n.contains(item));
}
});
}
});const items = document.querySelectorAll('.faq__input');
const onChange = ({ target: t }) => t
.closest('.faq__items')
.querySelectorAll('.faq__question--top')
.forEach(n => n.classList.toggle('active', n.nextElementSibling.checked));
items.forEach(n => n.addEventListener('change', onChange));.faq__item вместо .faq__question--top. Если в будущем задумаете стилизовать внутри выбранного .faq__item элементы, находящиеся за пределами .faq__question--top, то не придётся переписывать js-код.const itemSelector = '.faq__item';
const radioSelector = '.faq__input';
const activeClass = 'active';
const toggleActiveClass = radioGroupName => document
.querySelectorAll(`${radioSelector}[name="${radioGroupName}"]`)
.forEach(n => n.closest(itemSelector).classList.toggle(activeClass, n.checked));document.querySelectorAll(radioSelector).forEach(function(n) {
n.addEventListener('change', this);
}, e => toggleActiveClass(e.target.name));document.addEventListener('change', ({ target: t }) => {
if (t.matches(radioSelector)) {
toggleActiveClass(t.name);
}
});computed: {
ids() {
return this.strings.map(n => this.objects.find(m => m.title === n)?.id);
},
// или
ids() {
const ids = this.objects.reduce((acc, n) => (acc[n.title] = n.id, acc), {});
return this.strings.map(n => ids[n] ?? 'Получить id не удалось - объекта с указанным title нет');
},
// или
idByTitle() {
return Object.fromEntries(this.objects.map(n => [ n.title, n.id ]));
},
ids() {
const ids = this.idByTitle;
return this.strings.reduce((acc, n) => (
Object.hasOwn(ids, n) && acc.push(ids[n]),
acc
), []);
},
// или
stringsSet() {
return new Set(this.strings);
},
ids() {
return this.objects.reduce((acc, n) => (
this.stringsSet.has(n.title) && acc.push(n.id),
acc
), []);
},
// или
idsByTitle() {
return this.objects.reduce((acc, n) => (
(acc[n.title] ??= []).push(n.id),
acc
), []);
},
ids() {
return this.strings.flatMap(n => this.idsByTitle[n] ?? []);
},
},computed, к сожалению не подходит
const result = array2.filter(function(n) {
return this.has(n.code);
}, new Set(array1.map(n => n.value)));const obj2 = Object.fromEntries(array2.map(n => [ n.code, n ]));
const result = array1.reduce((acc, n) => ((n = obj2[n.value]) && acc.push(n), acc), []);const result = array2.filter(n => array1.some(m => m.value === n.code));e.target.dataset.followerStylee.target? Ну, когда вы наводите курсор на слайд с data-атрибутом. На тот слайд, который не видно за вложенной в него картинкой.target хватать, а пытаться найти у него предка с нужным вам атрибутом.
// значения withSeat вместо раскладывания в отдельные переменные собираете в объект
const withSeat = {
adult: 1,
teenager: 1,
babe: 0,
};
const passengers = cabins.flatMap(n => Object
.entries(n)
.flatMap(([ k, v ]) => Array.from(
{ length: v },
() => ({ withSeat: withSeat[k] })
))
);const obj = Object.fromEntries(Object
.entries(arr
.flatMap(Object.entries)
.reduce((acc, n) => ((acc[n[0]] ??= new Set).add(n[1]), acc), {}))
.map(([ k, v ]) => [ k, v.size === 1 ? [...v][0] : null ])
);const obj = arr.reduce((acc, n) => (
Object.keys(n).forEach(k => {
acc[k] = Object.hasOwn(acc, k) && n[k] !== acc[k] ? null : n[k];
}),
acc
), {});formatDate(date) {
const today = new Date();
return [ 'getFullYear', 'getMonth', 'getDate' ].every(n => date[n]() === today[n]())
? 'Today'
: flatpickr.formatDate(date, 'j M');
},const groupSelector = 'fieldset.js-tree-box';
const mainSelector = 'legend input';
const itemSelector = 'legend + span input';
const activeClass = 'active';
document.addEventListener('change', ({ target: t }) => {
const group = t.closest(groupSelector);
if (group) {
const main = group.querySelector(mainSelector);
const items = [...group.querySelectorAll(itemSelector)];
if (main === t) {
items.forEach(n => n.checked = t.checked);
} else {
const numChecked = items.reduce((acc, n) => acc + n.checked, 0);
main.checked = numChecked === items.length;
main.indeterminate = 0 < numChecked && numChecked < items.length;
}
group.classList.toggle(activeClass, main.checked);
}
});const sorted = (data, key) => Array
.from(data, n => [ n, key(n) ])
.sort((a, b) => a[1] - b[1])
.map(n => n[0]);
document.querySelector('.result').append(...sorted(
document.querySelector('.data').cloneNode(true).children,
n => +n.innerText
));делегирование не работает
в консоли выдает "e.target.closest is not a function"
const hoverCellNum = hoverCell.getAttribute('data-tdnum');
document.addEventListener('mouseenter', ({ target: t }) => {
if (t.matches?.('td._hight-light__cell')) {
t.closest('tbody').querySelectorAll('.table-big__row').forEach(n => {
n.cells[t.cellIndex].classList.add('_hover');
});
}
}, true);
document.addEventListener('mouseleave', e => {
if (e.target.matches?.('td._hight-light__cell')) {
document.querySelectorAll('._hover').forEach(n => n.classList.remove('_hover'));
}
}, true);