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Google Go: recover() example

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Here’s an example of how to use recover() in Google Go.

package main

import "fmt"

func gandalf( doTalkTo bool ){
	defer catch()
	if(doTalkTo){
		// Panic stops execution of the current function and stops unwinding the stack, calling an deferred functions along the way.
		panic("You shall not pass!")	
	}
}
// catch() must be called as a deferred 
func catch(){
	// recover() regains control over the program execution when panic() is called.
	// recover() returns is the argument passed from panic()
	if r := recover(); r != nil {
		fmt.Println("Error:", r)
	} else {
		fmt.Println("No problems occurred")
	}
}
func main() {
	gandalf(true)
	gandalf(false)
	//unwinds to the top of the stack and ends the program
	panic("Where am I going?");
}


Output:
Error: You shall not pass!
No problems occurred
panic: Where am I going?

goroutine 1 [running]:
main.main()

Demo: http://play.golang.org/p/xu9Jd1YI0T
More information here:

Effective Go - The Program Language
Larry Battle
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
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		Posted on May 6, 2013June 30, 2018Author Larry BattleCategories Backend techTags demo, Golang, Google go, recovery, tutorialLeave a comment on Google Go: recover() example


	
	
		Code of the Day: Coffeescript + jQuery, enforce max length for all input elements


		

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Enforce max length in all browsers since some browsers, IE8, don’t support maxlength for all input elements.
Coffeescript
# requires jQuery 1.6+ 
enforceMaxLength = ->
  $("[maxlength]").on "blur", ->
    $(@).val (index,val) -> 
      val.substring 0, $(@).attr("maxlength")

enforceMaxLength()

Javascript



// Generated by CoffeeScript 1.6.1
(function() {
  var enforceMaxLength;
 
  enforceMaxLength = function() {
    return $("[maxlength]").on("blur", function() {
      return $(this).val(function(index, val) {
        return val.substring(0, $(this).attr("maxlength"));
      });
    });
  };
 
  enforceMaxLength();
 
}).call(this);
// Generated by CoffeeScript 1.6.1
(function() {
  var enforceMaxLength;

  enforceMaxLength = function() {
    return $("[maxlength]").on("blur", function() {
      return $(this).val(function(index, val) {
        return val.substring(0, $(this).attr("maxlength"));
      });
    });
  };

  enforceMaxLength();

}).call(this);

Larry Battle
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
More Posts  - Website 
Follow Me:



	
	
		Posted on March 10, 2013May 7, 2013Author Larry BattleCategories Frontend TechTags code of the day1 Comment on Code of the Day: Coffeescript + jQuery, enforce max length for all input elements




	
	
		Code of the day: Javascript check if an object is empty
	


	
		

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`isObjectEmpty()` is a function that will only return true if the passed an object that contains no keys.

This is different than jQuery.isEmptyObject() because the passed argument MUST be an object.



/**
* Check to see if an object has any keys.
* @param {Object} obj
* @return {Boolean}
* @author Larry Battle <bateru.com/news>
* @license WTFPL
**/
var isObjectEmpty = function( obj ) {
	var name;
	for ( name in obj ) {
		return false;
	}
	return obj != null && typeof obj === "object";
};
/**
* Check to see if an object has any keys.
* @param {Object} obj
* @return {Boolean}
* @author Larry Battle <bateru.com/news>
* @license WTFPL
**/
var isObjectEmpty = function( obj ) {
	var name;
	for ( name in obj ) {
		return false;
	}
	return obj != null && typeof obj === "object";
};



Larry Battle
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
More Posts  - Website 
Follow Me:
	


	
	
		Posted on March 4, 2013June 30, 2018Author Larry BattleCategories Frontend Tech, TutorialsTags code of the day, demo, Javascript, object has keysLeave a comment on Code of the day: Javascript check if an object is empty			





	
	
		Code of the Day: Javascript Auto-complete date format MMDDYYYY
	


	
		

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/**
* This function helps to autocomplete the date format MMDDYYY
* Converts M to 0M and MMD to MM0D. Ex. `1/` to `01/`, `01/1/` to `01/01/`
* Adds slash for MM and MMDD Ex. `01` to `01/`, `01/02` to `01/02/`
* Converts YY to YYYY. Ex. `01/01/01` to `01/01/2001`
*
* @param {String} str
* @return {String}
*/
var autocompleteMMDDYYYYDateFormat = function (str) {
        str = str.trim();
        var matches, year,
                looksLike_MM_slash_DD = /^(\d\d\/)?\d\d$/,
                looksLike_MM_slash_D_slash = /^(\d\d\/)?(\d\/)$/,
                looksLike_MM_slash_DD_slash_DD = /^(\d\d\/\d\d\/)(\d\d)$/;
 
        if( looksLike_MM_slash_DD.test(str) ){
                str += "/";
        }else if( looksLike_MM_slash_D_slash.test(str) ){
                str = str.replace( looksLike_MM_slash_D_slash, "$10$2");
        }else if( looksLike_MM_slash_DD_slash_DD.test(str) ){
                matches = str.match( looksLike_MM_slash_DD_slash_DD );
                year = Number( matches[2] ) < 20 ? "20" : "19";
                str = String( matches[1] ) + year + String(matches[2]);
        }
        return str;
};
/**
* This function helps to autocomplete the date format MMDDYYY
* Converts M to 0M and MMD to MM0D. Ex. `1/` to `01/`, `01/1/` to `01/01/`
* Adds slash for MM and MMDD Ex. `01` to `01/`, `01/02` to `01/02/`
* Converts YY to YYYY. Ex. `01/01/01` to `01/01/2001`
*
* @param {String} str
* @return {String}
*/
var autocompleteMMDDYYYYDateFormat = function (str) {
        str = str.trim();
        var matches, year,
                looksLike_MM_slash_DD = /^(\d\d\/)?\d\d$/,
                looksLike_MM_slash_D_slash = /^(\d\d\/)?(\d\/)$/,
                looksLike_MM_slash_DD_slash_DD = /^(\d\d\/\d\d\/)(\d\d)$/;

        if( looksLike_MM_slash_DD.test(str) ){
                str += "/";
        }else if( looksLike_MM_slash_D_slash.test(str) ){
                str = str.replace( looksLike_MM_slash_D_slash, "$10$2");
        }else if( looksLike_MM_slash_DD_slash_DD.test(str) ){
                matches = str.match( looksLike_MM_slash_DD_slash_DD );
                year = Number( matches[2] ) < 20 ? "20" : "19";
                str = String( matches[1] ) + year + String(matches[2]);
        }
        return str;
};


Demo

Larry Battle
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
More Posts  - Website 
Follow Me:
	


	
	
		Posted on March 4, 2013July 1, 2018Author Larry BattleCategories Frontend Tech, TutorialsTags code of the day, Javascript, jquery5 Comments on Code of the Day: Javascript Auto-complete date format MMDDYYYY			




	
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