End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Array#zip
array.zip(*other_arrays) → new_array
array.zip(*other_arrays) {|other_array| ... } → nil
array.c
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static VALUE
rb_ary_zip(int argc, VALUE *argv, VALUE ary)
{
int i, j;
long len = RARRAY_LEN(ary);
VALUE result = Qnil;
for (i=0; i<argc; i++) {
argv[i] = take_items(argv[i], len);
}
if (rb_block_given_p()) {
int arity = rb_block_arity();
if (arity > 1) {
VALUE work, *tmp;
tmp = ALLOCV_N(VALUE, work, argc+1);
for (i=0; i<RARRAY_LEN(ary); i++) {
tmp[0] = RARRAY_AREF(ary, i);
for (j=0; j<argc; j++) {
tmp[j+1] = rb_ary_elt(argv[j], i);
}
rb_yield_values2(argc+1, tmp);
}
if (work) ALLOCV_END(work);
}
else {
for (i=0; i<RARRAY_LEN(ary); i++) {
VALUE tmp = rb_ary_new2(argc+1);
rb_ary_push(tmp, RARRAY_AREF(ary, i));
for (j=0; j<argc; j++) {
rb_ary_push(tmp, rb_ary_elt(argv[j], i));
}
rb_yield(tmp);
}
}
}
else {
result = rb_ary_new_capa(len);
for (i=0; i<len; i++) {
VALUE tmp = rb_ary_new_capa(argc+1);
rb_ary_push(tmp, RARRAY_AREF(ary, i));
for (j=0; j<argc; j++) {
rb_ary_push(tmp, rb_ary_elt(argv[j], i));
}
rb_ary_push(result, tmp);
}
}
return result;
}
When no block given, returns a new Array new_array of size self.size whose elements are Arrays.
Each nested array new_array[n] is of size other_arrays.size+1, and contains:
-
The nth element of
self. -
The nth element of each of the
other_arrays.
If all other_arrays and self are the same size:
Example
a = [:a0, :a1, :a2, :a3] b = [:b0, :b1, :b2, :b3] c = [:c0, :c1, :c2, :c3] d = a.zip(b, c) d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]
If any array in other_arrays is smaller than self, fills to self.size with nil:
Example
a = [:a0, :a1, :a2, :a3] b = [:b0, :b1, :b2] c = [:c0, :c1] d = a.zip(b, c) d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, nil], [:a3, nil, nil]]
If any array in other_arrays is larger than self, its trailing elements are ignored:
Example
a = [:a0, :a1, :a2, :a3] b = [:b0, :b1, :b2, :b3, :b4] c = [:c0, :c1, :c2, :c3, :c4, :c5] d = a.zip(b, c) d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]
When a block is given, calls the block with each of the sub-arrays (formed as above); returns nil
Example
a = [:a0, :a1, :a2, :a3] b = [:b0, :b1, :b2, :b3] c = [:c0, :c1, :c2, :c3] a.zip(b, c) {|sub_array| p sub_array} # => nil
Output:
Example
[:a0, :b0, :c0] [:a1, :b1, :c1] [:a2, :b2, :c2] [:a3, :b3, :c3]