Produces a dictionary from a given sequence of key, value tuples eval string Evaluates a string to return an object…useful for mathematical computations.
Kernel The Kernel module is included by class Objectso its methods are available in every Ruby object. The Kernel instance methods are documented in class Object while the module methods are documented here. These methods are called without a receiver and thus can be called in functional form: Returns an empty Hash when arg is nil or .
Numeric types are converted directly with floating point numbers being truncated. If arg is a String, when base is omitted or equals zero, radix indicators 0, 0b, and 0x are honored.
In any case, strings should be strictly conformed to numeric representation. Passing nil raises a TypeError. If called outside of a method, it returns nil. It means symlinks in the path is resolved. The return value equals to File. If multiple handlers are registered, they are executed in reverse order of registration.
This object can be used when calling eval to execute the evaluated command in this environment.
See also the description of class Binding. You need to require 'continuation' before using this method. The value returned by the callcc is the value of the block, or the value passed to cont. See class Continuation for more details.
Also see throw for an alternative mechanism for unwinding a call stack.
The optional start parameter determines the number of initial stack entries to omit from the top of the stack. A second optional length parameter can be used to limit how many entries are returned from the stack.
Returns nil if start is greater than the size of current execution stack. Optionally you can pass a range, which will return an array containing the entries within the specified range.
Location for more information.
If throw is not called, the block executes normally, and catch returns the value of the last expression evaluated. When found, the block stops executing and returns val or nil if no second argument was given to throw.
This object can then be used as the argument to throw, and will match the correct catch block. If binding is given, which must be a Binding object, the evaluation is performed in its context. If the optional filename and lineno parameters are present, they will be used when reporting syntax errors.
If the string from the first form exec "command" follows these simple rules: Note that this behavior is observable by pid obtained return value of spawn and IO pid for IO.
In the second form exec "command1", "arg1", In the third form exec ["command", "argv0"], "arg1", In order to execute the command, one of the exec 2 system calls are used, so the running command may inherit some of the environment of the original program including open file descriptors.
This behavior is modified by the given env and options parameters. If the command fails to execute typically Errno:: This method modifies process attributes according to given options before exec 2 system call. The modified attributes may be retained when exec 2 system call fails.
For example, hard resource limits are not restorable. Consider to create a child process using::To write a program to check if an integer is a power of two, you could follow two basic strategies: check the number based on its decimal value, or check it based on its binary representation.
1 – Introduction Lua is a powerful, efficient, lightweight, embeddable scripting language.
It supports procedural programming, object-oriented programming, functional programming, data-driven programming, and data description. I need to work with a binary number. I tried writing: const x = ; But it didn't work. I know that I can use an hexadecimal number that has the same value as , but I want to know.
Jun 26, · In this video, I will show you how to convert an integer number to binary format string and display it using C/C++ NOTE: . The Kernel module is included by class Object, so its methods are available in every Ruby object..
The Kernel instance methods are documented in class Object while the module methods are documented here. These methods are called without a receiver and thus can be called in functional form.
contents · index · other versions · english · português · español. 1 – Introduction Lua is an extension programming language designed to support general procedural programming with data description facilities.
It also offers good support for object-oriented programming, functional programming, and data-driven programming.