JavaScript It is the most critical pillar in network development .

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Array scrambling

When using algorithms that require some degree of randomization , You will often find that shuffling arrays is a very necessary skill . The following clip is O(n log n) To shuffle an array in place .

const shuffleArray = (arr) => arr.sort(() => Math.random() - 0.5) .
//  test 
const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
console.log(shuffleArray(arr)).

Copy to clipboard

stay Web In the application , Copy to clipboard is rapidly becoming popular because of its convenience to users .

const copyToClipboard = (text) =>
  navigator.clipboard?.writeText && navigator.clipboard.writeText（text）.
//  test 
copyToClipboard("Hello World!").

Be careful ： according to caniuse, The method is right 93.08% Effective for global users . Therefore, you must check whether the user's browser supports this API. To support all users , You can use an input and copy its contents .

Array weight removal

Each language has its own Hash list implementation , stay JavaScript in , It is called Set. You can use Set Data structures easily get unique elements from an array .

const getUnique = (arr) => [...new Set(arr)].
//  test 
const arr = [1, 1, 2, 3, 3, 4, 4, 5, 5];
console.log(getUnique(arr)).

Detect dark mode

With the popularity of dark mode , If the user has enabled dark mode on their device , So it's ideal to switch your application to dark mode . Fortunately, , Media queries can be used to make this task simple .

const isDarkMode = () =>
  window.matchMedia &&
  window.matchMedia("(prefers-color-scheme: dark)").matches.
//  test 
console.log(isDarkMode()).

according to caniuse The data of ,matchMedia The support rate is 97.19%.

Scroll to top

Beginners often find it difficult to scroll elements correctly . The simplest way to scroll elements is to use scrollIntoView Method . Add behavior ."smooth " To achieve smooth scrolling animation .

const scrollToTop = (element) =>
  element.scrollIntoView({ behavior: "smooth", block: "start" }).

Scroll to the bottom

It's like scrollToTop The method is the same ,scrollToBottom The method can also be used scrollIntoView The method is easy to implement , Just switch the block value to end

const scrollToBottom = (element) =>
  element.scrollIntoView({ behavior: "smooth", block: "end" }).

Generate random colors

Does your application rely on random color generation ？ Don't look anymore , The following code snippet can meet your requirements

const generateRandomHexColor = () =>
  `#${Math.floor(Math.random() * 0xffffff) .toString(16)}`;

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