[Immutable,js] Iterating over an immutable.js Map ()

Immutable.js provides several methods to iterate over an immutable.map (). These also apply to the other immutable structures found within the Immutable.js family, such as Set and List. The primary methods is map and ForEach, but we'll also cover filter and GroupBy.

// map ()  return todos.map (todo = {    return  todo.text  }); // filter ()  return todos.filter (todo = {    return  todo.completed;  }) // groupBy ()--return new immtuable Map  return todos.groupby (todo = {    return  todo.completed  })

Notice, only ForEach method would actually change its value!

// ForEach () function Markalltodosascomplete (todos) {  return todos.foreach (todo = {    true   });}

[Immutable,js] Iterating over an immutable.js Map ()