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A definition first (from the internet):<\/p>\n
The finally block triggers regardless of:<\/p>\n Consider this example\u00a0where there\u2019s no error<\/strong>:<\/p>\n Note that the \u201cRest of the code outside try-catch\u201d doesn\u2019t get logged on the console<\/strong><\/em><\/p><\/blockquote>\n The finally block will override the return statement written inside the try block.<\/p>\n Note that the \u201cRest of the code outside try-catch\u201d doesn\u2019t get logged on the console because of the return statement<\/strong><\/em><\/p><\/blockquote>\n From both the example, it becomes apparent that\u00a0 Consider this example\u00a0where there is no<\/strong>\u00a0 Note that this time, \u201cRest of the code outside try-catch\u201d gets printed on the console because there is no return statement in this example implementation<\/strong><\/em><\/p>\n<\/blockquote>\n A good use-case for finally block can be to put important codes such as clean up code e.g. closing the file or closing the connection<\/strong>.<\/p>\n Hence, we may not necessarily need a finally{\u2026} block in our code all the time, but it can serve an important purpose for certain similar use-cases.<\/p>\n ***<\/p>\ntry-catch-finally<\/strong><\/code>\u00a0is used to handle runtime errors and prevent them from halting the execution of a program.<\/strong><\/p>\n\n
try-catch<\/code>\u00a0block<\/li>\ntry-catch<\/code>\u00a0block<\/li>\nreturn<\/code>\u00a0statement written inside the\u00a0try-catch<\/code>\u00a0block<\/li>\n<\/ol>\nExample 1<\/h4>\n
(()=><\/span>{\r\ntry<\/span> {\r\nconsole<\/span>.log<\/span>(`Try block triggered`<\/span>)\r\nreturn<\/span> \r\n} catch<\/span> (error) {\r\nconsole<\/span>.log<\/span>(error)\r\n}finally<\/span>{\r\nconsole<\/span>.log<\/span>('Finally triggered'<\/span>)\r\n}\r\n\r\nconsole<\/span>.log<\/span>(`Rest of the code outside try-catch`<\/span>)\r\n\r\n})()<\/pre>\n\/\/ Output\r\n<\/span>Try block triggered\r\n<\/span>Finally triggered<\/span><\/pre>\n(()=><\/span>{\r\ntry<\/span> {\r\n\r\nconsole<\/span>.log<\/span>(`Try block triggered`<\/span>)\r\n\r\nthrow<\/span> `Oops... an error occurred`<\/span> \r\n\r\n} catch<\/span> (error) {\r\n\r\nreturn<\/span> console<\/span>.log<\/span>(error)\r\n\r\n} finally<\/span>{\r\n\r\nconsole<\/span>.log<\/span>('Finally triggered'<\/span>)\r\n}\r\n\r\nconsole<\/span>.log<\/span>(`Rest of the code outside try-catch`<\/span>)\r\n})()<\/pre>\n\/\/Output\r\n<\/span>Try block triggered\r\n<\/span>Oops... an error occurred\r\n<\/span>Finally triggered\r\n<\/span><\/pre>\nfinally<\/code>\u00a0block gets executed while the code written outside the\u00a0try-catch-finally<\/code>\u00a0block doesn\u2019t get executed.<\/p>\nExample 3<\/h4>\n
return<\/code>\u00a0statement<\/strong>:<\/p>\n(()=><\/span>{\r\n try<\/span> {\r\n \r\n console<\/span>.log<\/span>(`Try block triggered`<\/span>)\r\n \r\n throw<\/span> `Oops... an error occurred`<\/span>\r\n \r\n } catch<\/span> (error) {\r\n \r\n console<\/span>.log<\/span>(error)\r\n \r\n }finally<\/span>{\r\n \r\n console<\/span>.log<\/span>('Finally triggered'<\/span>)\r\n \r\n }\r\n \r\n console<\/span>.log<\/span>(`Rest of the code outside try-catch`<\/span>)\r\n})()<\/span><\/pre>\n\/\/Output\r\nTry block triggered\r\n<\/span>Oops... an error occurred\r\n<\/span>Finally triggered\r\n<\/span>Rest of the code outside try-catch<\/span><\/pre>\n\n
Note of thanks \u2764\ufe0f<\/h3>\n
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