Returns a new hash with the results of running the block once for every value. This method does not change the keys.
h = { a: 1, b: 2, c: 3 } h.transform_values {|v| v * v + 1 } #=> { a: 2, b: 5, c: 10 } h.transform_values(&:to_s) #=> { a: "1", b: "2", c: "3" } h.transform_values.with_index {|v, i| "#{v}.#{i}" } #=> { a: "1.0", b: "2.1", c: "3.2" }
If no block is given, an enumerator is returned instead.
Invokes the given block once for each value in hsh, replacing it with the new value returned by the block, and then returns hsh. This method does not change the keys.
h = { a: 1, b: 2, c: 3 } h.transform_values! {|v| v * v + 1 } #=> { a: 2, b: 5, c: 10 } h.transform_values!(&:to_s) #=> { a: "2", b: "5", c: "10" } h.transform_values!.with_index {|v, i| "#{v}.#{i}" } #=> { a: "2.0", b: "5.1", c: "10.2" }
If no block is given, an enumerator is returned instead.
The regex marking a line as a comment. See CSV::new
for details
Returns true
if headers are written in output. See CSV::new
for details.
Returns true
blank lines are skipped by the parser. See CSV::new
for details.
Returns true if the ipaddr is an IPv4-mapped IPv6 address.
Returns true if the ipaddr is an IPv4-compatible IPv6 address.
Returns a new ipaddr built by converting the native IPv4 address into an IPv4-mapped IPv6 address.
Returns a new ipaddr built by converting the native IPv4 address into an IPv4-compatible IPv6 address.
Returns a string for DNS reverse lookup compatible with RFC3172.
Returns a string for DNS reverse lookup compatible with RFC1886.
Returns the names of the binding’s local variables as symbols.
def foo a = 1 2.times do |n| binding.local_variables #=> [:a, :n] end end
This method is the short version of the following code:
binding.eval("local_variables")
Returns the submatrix obtained by deleting the specified row and column.
Matrix.diagonal(9, 5, -3, 4).first_minor(1, 2) => 9 0 0 0 0 0 0 0 4
Returns the portion of the original string after the current match. Equivalent to the special variable $'
.
m = /(.)(.)(\d+)(\d)/.match("THX1138: The Movie") m.post_match #=> ": The Movie"
Returns the factorization of value
.
value
An arbitrary integer.
generator
Optional. A pseudo-prime generator. generator
.succ must return the next pseudo-prime number in the ascending order. It must generate all prime numbers, but may also generate non prime numbers too.
ZeroDivisionError
when value
is zero.
For an arbitrary integer:
n = p_1**e_1 * p_2**e_2 * .... * p_n**e_n,
prime_division
(n) returns:
[[p_1, e_1], [p_2, e_2], ...., [p_n, e_n]]. Prime.prime_division(12) #=> [[2,2], [3,1]]
Raises PStore::Error
if the calling code is not in a PStore#transaction
.
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