Method: Enumerable#map

Defined in:

enum.c

#collect {|obj| ... } ⇒ Array #map {|obj| ... } ⇒ Array #collect ⇒ Object #map ⇒ Object

Returns a new array with the results of running block once for every element in enum.

If no block is given, an enumerator is returned instead.

(1..4).map { |i| i*i }      #=> [1, 4, 9, 16]
(1..4).collect { "cat"  }   #=> ["cat", "cat", "cat", "cat"]

Overloads:

• #collect {|obj| ... } ⇒ Array

  Yields:

  • (obj)

  Returns:

  • (Array)
• #map {|obj| ... } ⇒ Array

  Yields:

  • (obj)

  Returns:

  • (Array)

# File 'enum.c', line 571

static VALUE
enum_collect(VALUE obj)
{
    VALUE ary;
    int min_argc, max_argc;

    RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);

    ary = rb_ary_new();
    min_argc = rb_block_min_max_arity(&max_argc);
    rb_lambda_call(obj, id_each, 0, 0, collect_i, min_argc, max_argc, ary);

    return ary;
}