svelte/test/js/samples/each-block-keyed/expected-bundle.js

function noop() {}

function assign(tar, src) {
	for (var k in src) tar[k] = src[k];
	return tar;
}

function append(target, node) {
	target.appendChild(node);
}

function insert(target, node, anchor) {
	target.insertBefore(node, anchor);
}

function detachNode(node) {
	node.parentNode.removeChild(node);
}

function createElement(name) {
	return document.createElement(name);
}

function createText(data) {
	return document.createTextNode(data);
}

function createComment() {
	return document.createComment('');
}

function setData(text, data) {
	text.data = '' + data;
}

function destroyBlock(block, lookup) {
	block.d(1);
	lookup[block.key] = null;
}

function updateKeyedEach(old_blocks, component, changed, get_key, dynamic, ctx, list, lookup, node, destroy, create_each_block, intro_method, next, get_context) {
	var o = old_blocks.length;
	var n = list.length;

	var i = o;
	var old_indexes = {};
	while (i--) old_indexes[old_blocks[i].key] = i;

	var new_blocks = [];
	var new_lookup = {};
	var deltas = {};

	var i = n;
	while (i--) {
		var child_ctx = get_context(ctx, list, i);
		var key = get_key(child_ctx);
		var block = lookup[key];

		if (!block) {
			block = create_each_block(component, key, child_ctx);
			block.c();
		} else if (dynamic) {
			block.p(changed, child_ctx);
		}

		new_blocks[i] = new_lookup[key] = block;

		if (key in old_indexes) deltas[key] = Math.abs(i - old_indexes[key]);
	}

	var will_move = {};
	var did_move = {};

	function insert(block) {
		block[intro_method](node, next);
		lookup[block.key] = block;
		next = block.first;
		n--;
	}

	while (o && n) {
		var new_block = new_blocks[n - 1];
		var old_block = old_blocks[o - 1];
		var new_key = new_block.key;
		var old_key = old_block.key;

		if (new_block === old_block) {
			// do nothing
			next = new_block.first;
			o--;
			n--;
		}

		else if (!new_lookup[old_key]) {
			// remove old block
			destroy(old_block, lookup);
			o--;
		}

		else if (!lookup[new_key] || will_move[new_key]) {
			insert(new_block);
		}

		else if (did_move[old_key]) {
			o--;

		} else if (deltas[new_key] > deltas[old_key]) {
			did_move[new_key] = true;
			insert(new_block);

		} else {
			will_move[old_key] = true;
			o--;
		}
	}

	while (o--) {
		var old_block = old_blocks[o];
		if (!new_lookup[old_block.key]) destroy(old_block, lookup);
	}

	while (n) insert(new_blocks[n - 1]);

	return new_blocks;
}

function blankObject() {
	return Object.create(null);
}

function destroy(detach) {
	this.destroy = noop;
	this.fire('destroy');
	this.set = noop;

	this._fragment.d(detach !== false);
	this._fragment = null;
	this._state = {};
}

function _differs(a, b) {
	return a != a ? b == b : a !== b || ((a && typeof a === 'object') || typeof a === 'function');
}

function fire(eventName, data) {
	var handlers =
		eventName in this._handlers && this._handlers[eventName].slice();
	if (!handlers) return;

	for (var i = 0; i < handlers.length; i += 1) {
		var handler = handlers[i];

		if (!handler.__calling) {
			try {
				handler.__calling = true;
				handler.call(this, data);
			} finally {
				handler.__calling = false;
			}
		}
	}
}

function get() {
	return this._state;
}

function init(component, options) {
	component._handlers = blankObject();
	component._bind = options._bind;

	component.options = options;
	component.root = options.root || component;
	component.store = options.store || component.root.store;
}

function on(eventName, handler) {
	var handlers = this._handlers[eventName] || (this._handlers[eventName] = []);
	handlers.push(handler);

	return {
		cancel: function() {
			var index = handlers.indexOf(handler);
			if (~index) handlers.splice(index, 1);
		}
	};
}

function set(newState) {
	this._set(assign({}, newState));
	if (this.root._lock) return;
	this.root._lock = true;
	callAll(this.root._beforecreate);
	callAll(this.root._oncreate);
	callAll(this.root._aftercreate);
	this.root._lock = false;
}

function _set(newState) {
	var oldState = this._state,
		changed = {},
		dirty = false;

	for (var key in newState) {
		if (this._differs(newState[key], oldState[key])) changed[key] = dirty = true;
	}
	if (!dirty) return;

	this._state = assign(assign({}, oldState), newState);
	this._recompute(changed, this._state);
	if (this._bind) this._bind(changed, this._state);

	if (this._fragment) {
		this.fire("state", { changed: changed, current: this._state, previous: oldState });
		this._fragment.p(changed, this._state);
		this.fire("update", { changed: changed, current: this._state, previous: oldState });
	}
}

function callAll(fns) {
	while (fns && fns.length) fns.shift()();
}

function _mount(target, anchor) {
	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
}

var proto = {
	destroy,
	get,
	fire,
	on,
	set,
	_recompute: noop,
	_set,
	_mount,
	_differs
};

/* generated by Svelte vX.Y.Z */

function create_main_fragment(component, ctx) {
	var each_blocks_1 = [], each_lookup = blankObject(), each_anchor;

	var each_value = ctx.things;

	const get_key = ctx => ctx.thing.id;

	for (var i = 0; i < each_value.length; i += 1) {
		let child_ctx = get_each_context(ctx, each_value, i);
		let key = get_key(child_ctx);
		each_blocks_1[i] = each_lookup[key] = create_each_block(component, key, child_ctx);
	}

	return {
		c() {
			for (i = 0; i < each_blocks_1.length; i += 1) each_blocks_1[i].c();

			each_anchor = createComment();
		},

		m(target, anchor) {
			for (i = 0; i < each_blocks_1.length; i += 1) each_blocks_1[i].m(target, anchor);

			insert(target, each_anchor, anchor);
		},

		p(changed, ctx) {
			const each_value = ctx.things;
			each_blocks_1 = updateKeyedEach(each_blocks_1, component, changed, get_key, 1, ctx, each_value, each_lookup, each_anchor.parentNode, destroyBlock, create_each_block, "m", each_anchor, get_each_context);
		},

		d(detach) {
			for (i = 0; i < each_blocks_1.length; i += 1) each_blocks_1[i].d(detach);

			if (detach) {
				detachNode(each_anchor);
			}
		}
	};
}

// (1:0) {#each things as thing (thing.id)}
function create_each_block(component, key_1, ctx) {
	var div, text_value = ctx.thing.name, text;

	return {
		key: key_1,

		first: null,

		c() {
			div = createElement("div");
			text = createText(text_value);
			this.first = div;
		},

		m(target, anchor) {
			insert(target, div, anchor);
			append(div, text);
		},

		p(changed, ctx) {
			if ((changed.things) && text_value !== (text_value = ctx.thing.name)) {
				setData(text, text_value);
			}
		},

		d(detach) {
			if (detach) {
				detachNode(div);
			}
		}
	};
}

function get_each_context(ctx, list, i) {
	const child_ctx = Object.create(ctx);
	child_ctx.thing = list[i];
	child_ctx.each_value = list;
	child_ctx.thing_index = i;
	return child_ctx;
}

function SvelteComponent(options) {
	init(this, options);
	this._state = assign({}, options.data);
	this._intro = true;

	this._fragment = create_main_fragment(this, this._state);

	if (options.target) {
		this._fragment.c();
		this._mount(options.target, options.anchor);
	}
}

assign(SvelteComponent.prototype, proto);

export default SvelteComponent;