En versiones previas de NodeJS / JavaScript en el Navegador, habrías usado "callbacks". Lo que lleva al "callback hell".

## Coroutines { #coroutines }

				"text/x-lua",
				"text/x-ml",
				"text/x-matlab",
				"application/x-matlab-data",
				"text/x-modula",
				"text/x-objcsrc",
				"text/x-ocaml",
				"text/x-pascal",
				"text/x-perl",
				"text/x-php",
				"text/x-prolog",
				"text/x-python",
				"text/x-rst",
				"text/x-rexx",
				"text/x-ruby",
				"text/x-scala",
				"text/x-scheme",
				"text/x-sed",

labels.facet_filetype_image=Изображение
labels.facet_filetype_java=Java
labels.facet_filetype_javascript=JavaScript
labels.facet_filetype_json=Json
labels.facet_filetype_ocaml=OCaml
labels.facet_filetype_perl=Perl
labels.facet_filetype_php=PHP
labels.facet_filetype_properties=Файл свойств
labels.facet_filetype_python=Python
labels.facet_filetype_ruby=Ruby
labels.facet_filetype_scala=Scala

    @Override
    public @Nullable E peek() {
      synchronized (mutex) {
        return delegate().peek();
      }
    }

    @Override
    public @Nullable E poll() {
      synchronized (mutex) {
        return delegate().poll();
      }
    }

    @Override
    public E remove() {
      synchronized (mutex) {
        return delegate().remove();
      }
    }

    @Override
    public @Nullable E peek() {
      synchronized (mutex) {
        return delegate().peek();
      }
    }

    @Override
    public @Nullable E poll() {
      synchronized (mutex) {
        return delegate().poll();
      }
    }

    @Override
    public E remove() {
      synchronized (mutex) {
        return delegate().remove();
      }
    }

labels.facet_filetype_image=Image
labels.facet_filetype_java=Java
labels.facet_filetype_javascript=JavaScript
labels.facet_filetype_json=Json
labels.facet_filetype_ocaml=OCaml
labels.facet_filetype_perl=Perl
labels.facet_filetype_php=PHP
labels.facet_filetype_properties=Fichier de propriétés
labels.facet_filetype_python=Python
labels.facet_filetype_ruby=Ruby
labels.facet_filetype_scala=Scala

labels.facet_filetype_image=Immagine
labels.facet_filetype_java=Java
labels.facet_filetype_javascript=JavaScript
labels.facet_filetype_json=Json
labels.facet_filetype_ocaml=OCaml
labels.facet_filetype_perl=Perl
labels.facet_filetype_php=PHP
labels.facet_filetype_properties=File di proprietà
labels.facet_filetype_python=Python
labels.facet_filetype_ruby=Ruby
labels.facet_filetype_scala=Scala

   background-color: lighten($dark, 10%);\n  }\n  .jsgrid-edit-row > .jsgrid-cell,\n  .jsgrid-filter-row > .jsgrid-cell,\n  .jsgrid-grid-body, .jsgrid-grid-header,\n  .jsgrid-header-row > .jsgrid-header-cell,\n  .jsgrid-insert-row > .jsgrid-cell,\n  .jsgrid-row > .jsgrid-cell,\n  .jsgrid-alt-row > .jsgrid-cell {\n    border-color: $gray-600;\n  }\n  .jsgrid-header-row > .jsgrid-header-cell,\n  .jsgrid-row > .jsgrid-cell {\n    background-color: $dark;\n  }\n  .jsgrid-alt-row > .jsgrid-cell {\n  ...

labels.facet_filetype_image=图像
labels.facet_filetype_java=Java
labels.facet_filetype_javascript=JavaScript
labels.facet_filetype_json=Json
labels.facet_filetype_ocaml=OCaml
labels.facet_filetype_perl=Perl
labels.facet_filetype_php=PHP
labels.facet_filetype_properties=属性文件
labels.facet_filetype_python=Python
labels.facet_filetype_ruby=Ruby
labels.facet_filetype_scala=Scala
labels.facet_filetype_shell=Shell脚本

			testRead{1, "", io.ErrUnexpectedEOF},
			testRemaining{38, 38},
		},
	}, {
		maker: makeReg{"hello, world", 5},
		tests: []testFnc{
			testRemaining{5, 5},
			testRead{0, "", nil},
			testRead{4, "hell", nil},
			testRemaining{1, 1},
			testWriteTo{fileOps{"o"}, 1, nil},
			testRemaining{0, 0},
			testWriteTo{nil, 0, nil},
			testRead{0, "", io.EOF},
		},
	}, {