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instance method

Enumerator#with_index

(?::Integer offset) { (E arg0, ::Integer arg1) -> untyped } -> R

(?::Integer offset) -> ::Enumerator[[ E, ::Integer ], R]

e.with_index(offset = 0) {|(*args), idx| ... }

e.with_index(offset = 0)

static VALUE
enumerator_with_index(int argc, VALUE *argv, VALUE obj)
{
    VALUE memo;

    rb_check_arity(argc, 0, 1);
    RETURN_SIZED_ENUMERATOR(obj, argc, argv, enumerator_enum_size);
    memo = (!argc || NIL_P(memo = argv[0])) ? INT2FIX(0) : rb_to_int(memo);
    return enumerator_block_call(obj, enumerator_with_index_i, (VALUE)rb_imemo_memo_new(memo, 0, 0));
}

Iterates the given block for each element with an index, which starts from offset. If no block is given, returns a new Enumerator that includes the index, starting from offset

offset: the starting index to use

See also #size #with_object #rewind also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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