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Why does Array("1","2","3").join() convert strings to numbers in JavaScript?


Why does Array("1","2","3").join() convert strings to numbers in JavaScript?

By : evenagainstthewrold
Date : November 22 2020, 10:33 AM
it helps some times It doesn't. Quotes around strings are a notation thing, telling the system that you want to create a string; they're not part of the string itself. So when you join ["1", "2", "3"], you get "123", because that's the content of the three strings. It happens to look the same as if they'd been numbers, but this is only a coincidence.
There are a couple of ways to add quotes to strings. In general, you need to escape them in some way. The easiest way to do this in JavaScript is to put a backslash (\) in front of the character you want to escape, like this:
code :
Array("\"1\"","\"2"\","\"3\")
Array('"1"','"2"','"3"')
Array("'1'","'2'","'3'")


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C# - convert strings such as "uniqueidentifier", "timestamp", "image", "money",

C# - convert strings such as "uniqueidentifier", "timestamp", "image", "money",


By : Will Hughes
Date : March 29 2020, 07:55 AM
This might help you Simply work out what you want the types to be (which may vary by your database) and use a dictionary:
code :
static reaodnly Dictionary<string, Type> NameToTypeMap = 
new Dictionary<string, Type>
{ 
    { "uniqueidentifier", typeof(Guid) },
    { "timestamp", typeof(DateTimeOffset) },
    { "image", typeof(byte[]) },
    // etc
};
static Dictionary<string, Type> NameToTypeMap = GetTypeMap();

private static Dictionary<string, Type> GetTypeMap()
{ 
    Dictionary<string, Type> ret = new Dictionary<string, Type>();
    ret["uniqueidentifier"] = typeof(Guid);
    ret["timestamp"] = typeof(DateTimeOffset);
    ret["image"] = typeof(byte[]);
    // etc
    return ret;
}
Why Javascript doesn't include reserved keywords such as "Object", "Array", "Function", &q

Why Javascript doesn't include reserved keywords such as "Object", "Array", "Function", &q


By : user2360149
Date : March 29 2020, 07:55 AM
help you fix your problem Just to clarify, "function" is a reserved word, "Function" is a predefined object in the global scope.
The special words you list (although I'm not sure about "Method"?) are predefined JavaScript Classes and Objects in the global scope. They aren't necessarily reserved words because they aren't part of the language syntax and can, in some cases, be overridden. But yes, ordinarily they should not be used and should otherwise be treated the same way as 'reserved words'. See also Global Properties and Methods.
convert JSON array to Object (e.g. [{"Name":"A"},{"Name":"B"}] to {"Table1&

convert JSON array to Object (e.g. [{"Name":"A"},{"Name":"B"}] to {"Table1&


By : Amir Sandeep
Date : March 29 2020, 07:55 AM
should help you out How do I convert a JSON array: Example1: ,
So I need to just add the array into an object(?)
code :
var fn = function(mixed) {

    if(Object.prototype.toString.call(mixed) == '[object Array]') {
        mixed = {'Table1':mixed}
    }

    // do stuff
}
How do you convert an array of {"name":"myName","value":"myValue"} objects into

How do you convert an array of {"name":"myName","value":"myValue"} objects into


By : Wesley Tran
Date : March 29 2020, 07:55 AM
seems to work fine I'm new to JavaScript. I'm sure this would be easy for the experienced person.
code :
var my_JSON_object = {"Attributes":[{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"},{"Name":"myName","Value":"myValue"}]}

var my_new_JSON_object = { 'Attributes' : {} };

my_JSON_object.Attributes.forEach( function ( value, index ) {
    my_new_JSON_object.Attributes[ value.Name ] = value.Value;
} );
SQL convert "left join" with a "from" clause with multiple tables and a "where" condition

SQL convert "left join" with a "from" clause with multiple tables and a "where" condition


By : Daniel Melo
Date : March 29 2020, 07:55 AM
it helps some times Without a left join you could just use this (assuming that the foreign key constraint has functioned correctly):
code :
SELECT
  u.name,
  a.address
FROM user u
  JOIN appartment a ON u.appartment_id = a.id
UNION
SELECT
  name,
  NULL AS address
FROM user
WHERE apartment_id IS NULL
;
SELECT
  u.name,
  a.address
FROM user u
  JOIN appartment a ON u.appartment_id = a.id
UNION
SELECT
  name,
  NULL AS address
FROM user
WHERE
  NOT EXISTS (
      SELECT 1
      FROM appartment
      WHERE appartment.id
            = user.appartment_id)

);
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