Node.js check if file exists asynchronously

How to check if a file exists in Node.js? How to check this asynchronously? . . .

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How to exit a Node.js script programmatically?

How do I exit a Node.js script gracefully when a condition is met? . . .

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Reset all settings in Visual Studio 2015

I changed some of the options on Visual Studio 2015 IDE from Tools -> Options menu. How do i reset it all back to default without having to re-install? . . .

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Get a list of core Node.js modules

How can i get a complete list of all built-in modules available with my Node.js installation? . . .

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What is cookie location for IE11 in Windows 10?

I am running Windows 10, what is the location where cookies are stored for IE11 and Edge? . . .

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Copy data from one column to another in MySQL

I have a table with 3 columns, say col1, col2, col3 I want to copy all the data from col2 to col3, how can i do that? . . .

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Set decimal precision of result for Javascript floating point addition

I am trying to add two floating point numbers var sum = parseFloat(a) + parseFloat(b); How do i set the decimal precision of the result to one? Eg: 0.1+0.2 should give 0.3 . . .

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How to convert character to ascii value in Javascript?

I have to map an array of lowercase characters a to z to numbers 1 to 26. Example: [a,c,f] to [1,3,6] I tried  arr.map( function(x){ return (x-96); } )   However this returns an array o . . .

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PHP How to print associative array as a string ?

I have an associated array $myarray = array(                      "foo1" => "bar1",                 . . .

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Check if a string is Palindrome PHP

What is the best way to check if string is Palindrome in PHP? . . .

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PHP How to check if a key exists in an associative array?

Should i use isset() or array_key_exists()? . . .

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New line character not working in PHP?

Hi, echo "/n";   is not working for me somehow?   . . .

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how to check samba is installed on not in raspberry pi?

how can i check if samba is already installed or not in my raspberry pi? I have a folder named samba in /etc with 2 files smb.conf and gdbcommands  I can see 2 samba related packages in the list . . .

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E212: Can't open file for writing

I'm trying to edit the file /etc/samba/smb.conf in my Raspberry Pi using vi editor. When i try to save the file i get  this error "/etc/samba/smb.conf" E212: Can't open file for writing I am l . . .

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How to list files or directories starting with a character using ls command in Linux?

How do i list all files or directories starting with 'a' or 'b' using ls? I tried ls a* and it doesn't work? . . .

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