JavaScript单线会让您看起来像专业人士

[a, b] = [b, a];

const isEven = n => !(n & 1);

const reverseString = str => [...str].reverse().join('');

const randomColor = () => `#${Math.floor(Math.random()*0xffffff).toString(16).padStart(6, '0')}`;

const lastItem = arr => arr.at(-1);

const flatArray = arr => arr.flat(Infinity);

const toNumber = str => +str;

const uniqueArray = arr => [...new Set(arr)];

const intersection = (a, b) => a.filter(x => b.includes(x));

const shuffle = arr => arr.sort(() => Math.random() - 0.5);

const timestamp = () => Date.now();

const greet = name => name || 'guest';

const countOccurrences = (arr, val) => arr.reduce((a, v) => v === val ? a + 1 : a, 0);

const randomItem = arr => arr[Math.floor(Math.random() * arr.length)];

const rgbToHex = (r, g, b) => `#${((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1)}`;

const isPalindrome = str => str === [...str].reverse().join('');

const boolToNumber = bool => +bool;

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1);

const trimSpaces = str => str.replace(/\s+/g, '');

const randomBoolean = () => Math.random() >= 0.5;