JavaScript utility library lodash

Lodash is a JavaScript utility library that provides many commonly used functions and tools, which can help us more easily manipulate data and process logic.

debounce / anti-shake

Purpose / Usage: Used to limit the frequency of function execution, especially in input or search events.
Example / Code Example:

import { debounce } from 'lodash';
const handleSearch = debounce(() =&gt; {
  // Add search logic here}, 500);

explain /Detailed Explanation: debounceUsed to delay function execution until a specified inactive time has passed. It is usually used to prevent frequent search requests when user inputs.

filter / filter

Purpose / Usage: Used to filter elements in an array based on specific conditions.
Example / Code Example:

import { filter } from 'lodash';
const numbers = [1, 2, 3, 4, 5];
const evenNumbers = filter(numbers, num => num % 2 === 0);

Explanation / Detailed Explanation: filterUsed to filter elements in an array based on conditions, returning a new array of elements that meet the conditions.

groupBy / grouping

Purpose / Usage: Used to group arrays or objects by specific properties or conditions.
Example / Code Example:

import { groupBy } from 'lodash';
const people = [
  { name: 'Alice', age: 30 },
  { name: 'Bob', age: 28 },
  { name: 'Carol', age: 30 },
];
const groupedByAge = groupBy(people, 'age');

Explanation / Detailed Explanation: groupByAn array or object can be grouped into a new object based on the specified attribute or condition, where the key of each group is the value of the attribute value or condition.

reduce / Redeem

Purpose / Usage: Used to reduce elements in an array and combine them into a single value.
Example / Code Example:

import { reduce } from 'lodash';
const numbers = [1, 2, 3, 4, 5];
const sum = reduce(numbers, (acc, num) => acc + num, 0);

Explanation / Detailed Explanation: reduceUsed to apply elements in the array to the specified reduction function in turn, combining them into a single value (sum here).

find / find

Purpose / Usage: Used to find the first element in an array that meets a specific condition.
Example / Code Example:

import { find } from 'lodash';
const users = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Carol' },
];
const user = find(users, { name: 'Bob' });

Explanation / Detailed Explanation:findUsed to find the first element that meets the criteria in the array and return the found element object.

flatten / flatten

Purpose / Usage: Used to flatten multi-layer nested arrays into single-layer arrays.
Example / Code Example:

import { flatten } from 'lodash';
const nestedArray = [1, [2, [3, [4]], 5]];
const flatArray = flatten(nestedArray);

difference / difference set

Purpose / Usage: Used to calculate the difference between two arrays, that is, return elements that appear in the first array but not in the second array.
Example / Code Example:

import { difference } from 'lodash';
const array1 = [1, 2, 3, 4, 5];
const array2 = [3, 4, 5, 6, 7];
const diff = difference(array1, array2);

Explanation / Detailed Explanation: differenceUsed to find the difference between two arrays, returning elements that only appear in the first array.

intersection / intersection

Purpose / Usage: Used to calculate the intersection of two arrays, that is, return elements that appear in both arrays at the same time.
Example / Code Example:

import { intersection } from 'lodash';
const array1 = [1, 2, 3, 4, 5];
const array2 = [3, 4, 5, 6, 7];
const common = intersection(array1, array2);

Explanation / Detailed Explanation: intersectionUsed to find common elements between two arrays and return elements that appear in both arrays at the same time.

zip / compression

Purpose / Usage: Used to compress the corresponding elements of multiple arrays by index position.
Example / Code Example:

import { zip } from 'lodash';
const array1 = [1, 2, 3];
const array2 = ['a', 'b', 'c'];
const zipped = zip(array1, array2);

Explanation / Detailed Explanation: zipUsed to compress the corresponding elements of multiple arrays by index position, returning an array containing tuples.

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