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instance method

Enumerable#chunk_while

chunk_while {|element, next_element| ... } → enumerator

static VALUE
enum_chunk_while(VALUE enumerable)
{
    VALUE enumerator;
    VALUE pred;

    pred = rb_block_proc();

    enumerator = rb_obj_alloc(rb_cEnumerator);
    rb_ivar_set(enumerator, id_slicewhen_enum, enumerable);
    rb_ivar_set(enumerator, id_slicewhen_pred, pred);
    rb_ivar_set(enumerator, id_slicewhen_inverted, Qtrue);

    rb_block_call(enumerator, idInitialize, 0, 0, slicewhen_i, enumerator);
    return enumerator;
}

The returned Enumerator uses the block to partition elements into arrays (“chunks”); it calls the block with each element and its successor; begins a new chunk if and only if the block returns a truthy value:

Example:

Example

a = [1, 2, 4, 9, 10, 11, 12, 15, 16, 19, 20, 21]
e = a.chunk_while {|i, j| j == i + 1 }
e.each {|array| p array }

Output:

Example

[1, 2]
[4]
[9, 10, 11, 12]
[15, 16]
[19, 20, 21]

See also #chunk #collect #chain #collect_concat also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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