fn patch_children(
		parent: &mut util::LazyElement,
		old: &mut Vec<Node>,
		new: Vec<Node>,
	) -> Result<(), JsValue> {
		let mut old_it = old.iter_mut().peekable();
		let mut new_it = new.into_iter().peekable();
		let mut i = 0;

		// First patch all matching children. Most of the time child lists will
		// match, so this is the hottest loop.
		loop {
			let old_ch = old_it.peek();
			let new_ch = new_it.peek();
			if let Some(old_ch) = old_ch {
				if let Some(new_ch) = new_ch {
					if (old_ch.key.is_some() || new_ch.key.is_some())
						&& old_ch.key != new_ch.key
					{
						return Node::patch_children_by_key(
							parent, old, i, new_it,
						);
					}

					old_it.next().unwrap().patch(new_it.next().unwrap())?;
					i += 1;
					continue;
				}
			}
			break;
		}

		// Handle mismatched node counts using appends or deletes
		if new_it.peek().is_some() {
			// Append new nodes to end

			let mut w = util::Appender::new();
			old.reserve(new_it.size_hint().0);
			for mut new_ch in new_it {
				new_ch.write_html_to(&mut w).map_err(util::cast_error)?;
				old.push(new_ch);
			}
			parent.get()?.insert_adjacent_html("beforeend", &w.dump())?;
		} else if old_it.peek().is_some() {
			// Remove nodes from end

			for old_ch in old_it {
				old_ch.element.get()?.remove();
			}
			old.truncate(i);
		}

		Ok(())
	}
// Diff and patch 2 child lists
Diff and patch 2 child lists
Diff and patch 2 child lists
fn patch_children(
		parent: &mut util::LazyElement,
		old: &mut Vec<Node>,
		new: Vec<Node>,
	) -> Result<(), JsValue> {
		let mut old_it = old.iter_mut().peekable();
		let mut new_it = new.into_iter().peekable();
		let mut i = 0;
		// First patch all matching children. Most of the time child lists will
		// match, so this is the hottest loop.
		loop {
			let old_ch = old_it.peek();
			let new_ch = new_it.peek();
			if let Some(old_ch) = old_ch {
				if let Some(new_ch) = new_ch {
					if (old_ch.key.is_some() || new_ch.key.is_some())
						&& old_ch.key != new_ch.key
					{
						return Node::patch_children_by_key(
							parent, old, i, new_it,
						);
					}
					old_it.next().unwrap().patch(new_it.next().unwrap())?;
					i += 1;
					continue;
				}
			}
			break;
		}
		// Handle mismatched node counts using appends or deletes
		if new_it.peek().is_some() {
			// Append new nodes to end
			let mut w = util::Appender::new();
			old.reserve(new_it.size_hint().0);
			for mut new_ch in new_it {
				new_ch.write_html_to(&mut w).map_err(util::cast_error)?;
				old.push(new_ch);
			}
			parent.get()?.insert_adjacent_html("beforeend", &w.dump())?;
		} else if old_it.peek().is_some() {
			// Remove nodes from end
			for old_ch in old_it {
				old_ch.element.get()?.remove();
			}
			old.truncate(i);
		}
		Ok(())
	}
fn patch_children ( parent : & mut util :: LazyElement , old : & mut Vec < Node > , new : Vec < Node > , ) -> Result < ( ) , JsValue > { let mut old_it = old . iter_mut ( ) . peekable ( ) ; let mut new_it = new . into_iter ( ) . peekable ( ) ; let mut i = 0 ; // First patch all matching children. Most of the time child lists will // match, so this is the hottest loop. loop { let old_ch = old_it . peek ( ) ; let new_ch = new_it . peek ( ) ; if let Some ( old_ch ) = old_ch { if let Some ( new_ch ) = new_ch { if ( old_ch . key . is_some ( ) || new_ch . key . is_some ( ) ) && old_ch . key != new_ch . key { return Node :: patch_children_by_key ( parent , old , i , new_it , ) ; } old_it . next ( ) . unwrap ( ) . patch ( new_it . next ( ) . unwrap ( ) ) ? ; i += 1 ; continue ; } } break ; } // Handle mismatched node counts using appends or deletes if new_it . peek ( ) . is_some ( ) { // Append new nodes to end let mut w = util :: Appender :: new ( ) ; old . reserve ( new_it . size_hint ( ) . 0 ) ; for mut new_ch in new_it { new_ch . write_html_to ( & mut w ) . map_err ( util :: cast_error ) ? ; old . push ( new_ch ) ; } parent . get ( ) ? . insert_adjacent_html ( " " , & w . dump ( ) ) ? ; } else if old_it . peek ( ) . is_some ( ) { // Remove nodes from end for old_ch in old_it { old_ch . element . get ( ) ? . remove ( ) ; } old . truncate ( i ) ; } Ok ( ( ) ) }
Diff and patch 2 child lists
Diff and patch 2 child lists
parent
&mut util::LazyElement
old
&mut Vec<Node>
new
Vec<Node>