Method: Enumerator::Lazy#flat_map

Defined in:

enumerator.c

#collect_concat {|obj| ... } ⇒ Object #flat_map {|obj| ... } ⇒ Object

Returns a new lazy enumerator with the concatenated results of running block once for every element in lazy.

["foo", "bar"].lazy.flat_map {|i| i.each_char.lazy}.force
#=> ["f", "o", "o", "b", "a", "r"]

A value x returned by block is decomposed if either of the following conditions is true:

a) <i>x</i> responds to both each and force, which means that
   <i>x</i> is a lazy enumerator.
b) <i>x</i> is an array or responds to to_ary.

Otherwise, x is contained as-is in the return value.

[{a:1}, {b:2}].lazy.flat_map {|i| i}.force
#=> [{:a=>1}, {:b=>2}]

Overloads:

• #collect_concat {|obj| ... } ⇒ Object

  Yields:

  • (obj)
• #flat_map {|obj| ... } ⇒ Object

  Yields:

  • (obj)

# File 'enumerator.c', line 1601

static VALUE
lazy_flat_map(VALUE obj)
{
    if (!rb_block_given_p()) {
	rb_raise(rb_eArgError, "tried to call lazy flat_map without a block");
    }

    return lazy_set_method(rb_block_call(rb_cLazy, id_new, 1, &obj,
					 lazy_flat_map_func, 0),
			   Qnil, 0);
}