1-code.js

"use strict";

const immutableCollection = require("./");

let items = [{
	id: 1,
	color: "blue"
}, {
	id: 2,
	color: "red"
}, {
	id: 3,
	color: "red"
}, {
	id: 4,
	color: "red"
}, {
	id: 5,
	color: "blue"
}, {
	id: 6,
	color: "blue"
}, {
	id: 7,
	color: "red"
}];

let collection = immutableCollection(items);

let modified = collection
	.select((item) => item.color === "blue")
	.modify((selection) => {
		return selection
			.filter((item) => item.id % 2 === 0)
			.map((item) => ({ ... item, color: "green" }))
			.addAfter({ id: 13, color: "yellow" })
			.addAfter({ id: 14, color: "purple" })
			.addBefore({ id: 0, color: "orange" });
	});

console.log(modified);

2-output.js

[ { id: 2, color: 'red' },
  { id: 3, color: 'red' },
  { id: 4, color: 'red' },
  { id: 0, color: 'orange' },
  { id: 6, color: 'green' },
  { id: 13, color: 'yellow' },
  { id: 14, color: 'purple' },
  { id: 7, color: 'red' } ]