Method: Enumerator::Lazy#flat_map

Defined in:
enumerator.c

#collect_concat {|obj| ... } ⇒ Object #flat_map {|obj| ... } ⇒ Object Also known as: _enumerable_flat_map

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

["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:

  • x responds to both each and force, which means that x is a lazy enumerator.

  • x 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) 


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# File 'enumerator.c', line 2100

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_proc, 0),
			   Qnil, 0);
}