Ruby - Computer Science Hub

Reserved Words in any programming language are keywords whose meaning have been defined internally in the language itself. These words are not allowed to be used by Programmers as variable names or function names. If in case you do use these as variable/function names then during execution some error will be thrown. Below is a table listing all of Reserved Words in Ruby Programming Language with description for each one. Reserved WordDescriptionBEGINCode enclosed in { } to run before program runsENDCode enclosed in { } to run when program endsaliasCreate alias for existing method, operator, global variableandLogical AND OperatorbeginBegins a block of codebreakTerminate a loopcaseComparing an expression with matching when clause which closes with endclassDefining a classdef Defining a function/methoddefined?To check if some variable, function exists or notdoBegins a code block and execute code in the block, this ends with end keywordelseExecutes following code if previous conditional is not trueelsifExecutes following code if previous conditional is not trueendFor ending a code block which started with keywords like begin, class, def, do, ifensureAlways execute at block terminationfalseLogical Boolean false valuefor Begin a for loopifExecutes the code block in case conditional statement for if is trueinUsed with for loopmoduleDefining a modulenextJump to point immediately before evaluation of loop's conditionalnilEmpty or invalid or always falsenotLogical Negation OperatororLogical Or OperatorredoJump after a loop conditionalrescueEvaluates the expression after an exception is raisedretry• When called outside of rescue repates the method call• When called inside rescue jumps to top of blockreturnReturns a value from a method or code blockselfCurrent ObjectsuperCalls method of same name in the superclassthenSeparator used with if, unless, when, case, rescuetrueLogical Boolean trueundefMakes a method/function undefined in current classuntilExecute code block while conditional statement is falsewhenStarts a clause under case statementwhileExecutes the code block, until the conditional statement becomes falseyieldExecutes the code block which is passed to a method These are Reserved Words in Ruby Programming Language, while writing code in Ruby Language just don't use these words as variables or functions names. I hope that this article provided you information about Reserved Words in Ruby Programming Language. I have put together many other articles about Python, JavaScript and other programming languages, you can check those articles here - Python Tutorials, JavaScript Tutorials.