This article will share with you 11 JS tips that are helpful for development. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
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Array.from({ length: 1000 }, Math.random) // [ 0.6163093133259432, 0.8877401276499153, 0.4094354756035987, ...] - 1000 items
Array.from({ length: 1000 }, (v, i) => i) // [0, 1, 2, 3, 4, 5, 6....999]
const rgb2hex = ([r, g, b]) => `#${(1 << 24) + (r << 16) + (g << 8) + b}`.toString(16).substr(1); rgb2hex([76, 11, 181]); // #4c0bb5
How to convert it back? This is a great way to achieve that goal.
const hex2rgb = hex => [1, 3, 5].map((h) => parseInt(hex.substring(h, h + 2), 16)); hex2rgb("#4c0bb5"); // [76, 11, 181]
Use bitwise operations:
const value = 232; if (value & 1) console.log("odd"); else console.log("even"); // even
const isValidURL = (url) => { try { new URL(url); return true; } catch (error) { return false; } } isValidURL('https://segmentfault.com/u/minnanitkong/articles') // true isValidURL("https//invalidto"); // false
Sometimes we need to print the date 6 minutes ago, but we don’t want a large library to complete it. Here's a small snippet to do just that:
const fromAgo = (date) => { const ms = Date.now() - date.getTime(); const seconds = Math.round(ms / 1000); const minutes = Math.round(ms / 60000); const hours = Math.round(ms / 3600000); const days = Math.round(ms / 86400000); const months = Math.round(ms / 2592000000); const years = Math.round(ms / 31104000000); switch (true) { case seconds < 60: return `${seconds} second(s) ago"`; case minutes < 60: return `${minutes} minute(s) ago"`; case hours < 24: return `${hours} hour(s) ago"`; case days < 30: return `${days} day(s) ago`; case months < 12: return `${months} month(s) ago`; default: return `${years} year(s) ago`; } }; const createdAt = new Date(2021, 0, 5); fromAgo(createdAt); // 14 day(s) ago;
We do a lot of work when dealing with routes/paths, we always It needs to be acted upon. When we need to generate a path with parameters to push the browser there, generatePath
can help us!
const generatePath = (path, obj) => path.replace(/(:[a-z]+)/g, (v) => obj[v.substr(1)]); const route = "/app/:page/:id"; generatePath(route, { page: "products", id: 85, }); // /app/products/123
const getPathParams = (path, pathMap, serializer) => { path = path.split("/"); pathMap = pathMap.split("/"); return pathMap.reduce((acc, crr, i) => { if (crr[0] === ":") { const param = crr.substr(1); acc[param] = serializer && serializer[param] ? serializer[param](path[i]) : path[i]; } return acc; }, {}); }; getPathParams("/app/products/123", "/app/:page/:id"); // { page: 'products', id: '123' } getPathParams("/items/2/id/8583212", "/items/:category/id/:id", { category: v => ['Car', 'Mobile', 'Home'][v], id: v => +v }); // { category: 'Home', id: 8583212 }
const getQueryParams = url => url.match(/([^?=&]+)(=([^&]*))/g).reduce((total, crr) => { const [key, value] = crr.split("="); total[key] = value; return total; }, {}); getQueryParams("/user?name=Orkhan&age=30"); // { name: 'Orkhan', age: '30' }
Original address: https://dev.to/11-javascript-tips-and-tricks-to-code-like-a-superhero-vol-2-mp6
Author: Orkhan Jafarov
Translation address: https://segmentfault.com/a/1190000039122988
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