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class method
ENV.delete_if
ENV.delete_if {|name, value| ... } → ENV
ENV.delete_if → an_enumerator
hash.c
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static VALUE
env_delete_if(VALUE ehash)
{
RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
env_reject_bang(ehash);
return envtbl;
}
Calls the block with each environment variable name and value, deleting each environment variable for which the block returns a truthy value, and returning ENV (regardless of whether any deletions):
Example
ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2') ENV.delete_if { |name, value| name.start_with?('b') } # => ENV ENV # => {"foo"=>"0"} ENV.delete_if { |name, value| name.start_with?('b') } # => ENV
With no block given, returns a new Enumerator.