DawChihLiou

This notes is written by Sheldon. You can find me with #iOSBySheldon in Github, Youtube, Facebook, etc.

Need

Convert .mov/.MP4 to .gif

Reason

As a developer, I feel better to upload a short video when I create the pull request to show other viewers what I did in this PR. I tried .mov format directly got after finishing recording screen using Quicktime, however, gif offers preview in most web pages, and has smaller file size.

This is not limited to developer, anyone has this need can use this method to convert the files.

DawChihLiou

BinaryTree::new(1)
    .left(
        BinaryTree::new(2)
            .left(BinaryTree::new(4))
            .right(BinaryTree::new(5))
    )
    .right(BinaryTree::new(3))

DawChihLiou

#[test]
fn insert() {
    let mut tree = BinaryTree::new(1);
    tree.insert(2);
    tree.insert(3);
    tree.insert(4);
    tree.insert(5);
    assert_eq!(
        tree,
        BinaryTree::new(1)

DawChihLiou

#[test]
fn create_new_tree_with_from() {
    // `BinaryTree::from` takes in a reference of an array because borrowing is sufficient
    let tree = BinaryTree::from(&[1, 2, 3, 4, 5, 6]);
    assert_eq!(
      tree,
      BinaryTree::new(1)
          .left(
              BinaryTree::new(2)
                  .left(BinaryTree::new(4))

DawChihLiou

impl<T> BinaryTree<T> {
    pub fn from(new_values: &[T]) -> Self {
        let (first, rest) = new_values.split_first().unwrap();
        let mut root: BinaryTree<T> = BinaryTree::new(*first);
        for value in rest {
            root.insert(*value)
        }
        root
    }
}

DawChihLiou

#[derive(Debug, PartialEq)]
pub struct BinaryTree<T> {
    pub value: T,
    pub left: Option<Box<BinaryTree<T>>>,
    pub right: Option<Box<BinaryTree<T>>>,
}
impl<T> BinaryTree<T>
where
    T: Copy,
{

DawChihLiou

fn is_palindrome(str: String) -> bool {
    let mut chars = string.bytes();
    while let Some((front, back)) = chars.next().zip(chars.next_back()) {
        if front != back {
            return false;
        }
    }
    true
}

DawChihLiou

const encoder = new TextEncoder()
const decoder = new TextDecoder()
const bytes = encoder.encode('\u0061\u0301')
decoder.decode(bytes) // 'á'

DawChihLiou

function isPalindrome(str: string): boolean {
  return str === str.split('').reverse().join('')
}

DawChihLiou

/*
 *  lp       rp
 *  |        |
 *  v →    ← v
 * "aabbccbbaa"
 */
function isPalindrome(str: string): boolean {
  let lp = 0
  let rp = str.length - 1
  while (lp < rp) {