Method: Array#partition

Defined in:
ext/rmtools.cpp

#partition {|obj| ... } ⇒ Array

Same as Enumerable#partition, but twice faster

[5, 6, 1, 2, 4, 3].partition {|i| (i&1).zero?}   #=> [[2, 4, 6], [1, 3, 5]]

Yields:

  • (obj)

Returns:



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# File 'ext/rmtools.cpp', line 308

static VALUE rb_ary_partition(VALUE ary)
{
  VALUE select, reject;
  long i, len;

  RETURN_ENUMERATOR(ary, 0, 0);
  len = RARRAY_LEN(ary);
  select = rb_ary_new2(len);
  reject = rb_ary_new2(len);
  for (i = 0; i < len; i++)
    rb_ary_push((RTEST(rb_yield(RARRAY_PTR(ary)[i])) ? select : reject), RARRAY_PTR(ary)[i]);
  
  return rb_assoc_new(select, reject);
}