Enumerable#each_with_object

each_with_object(object) { |(*args), memo_object| ... } → object

each_with_object(object) → enumerator

static VALUE
enum_each_with_object(VALUE obj, VALUE memo)
{
    RETURN_SIZED_ENUMERATOR(obj, 1, &memo, enum_size);

    rb_block_call(obj, id_each, 0, 0, each_with_object_i, memo);

    return memo;
}

Calls the block once for each element, passing both the element and the given object:

Example

(1..4).each_with_object([]) {|i, a| a.push(i**2) }
# => [1, 4, 9, 16]

{foo: 0, bar: 1, baz: 2}.each_with_object({}) {|(k, v), h| h[v] = k }
# => {0=>:foo, 1=>:bar, 2=>:baz}

With no block given, returns an Enumerator.

See also #each_with_index #entries #each_slice #filter also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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