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Is there any function which adds 1 to the array element? [closed]

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I have a given array like this let arr1 = ['a','b','c'];
And I want output like this ['a1','b1','c1']
Which function should I use?

For this task, the map function is the best candidate. It generates a new array by applying the function given as argument to each element.
let arr1 = ['a','b','c'];
console.log(arr1.map(x=>`${x}1`));

How to get the array of strings that is in between curly braces inside source string in JavaScript [closed]

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Suppose the JavaScript variable is:
var sourceString="stack {overflow} is the best {place} to clear {technical} doubts";
Output javascript string array should contain: overflow,place,technical
or {overflow},{place},{technical}
I am fine with both the results.

You could use regex to accomplish this:
sourceString.match(/{.*?}/g)

var getMatchingGroups = function(s) {
var r=/\{(.*?)\}/g, a=[], m;
while (m = r.exec(s)) {
a.push(m[1]);
}
return a;
};
getMatchingGroups(sourceString) // ["overflow", "place", "technical"]

Converting a file to array with FS [closed]

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I have a simple "en.txt"
"TITLE" => "Amazing title of my page"
"COPYRIGHT" => "Copyright my site"
"BLABLA" => "A amazing sentence"
And I would like convert this in array for nodeJS with FS.
Thanks for your help.

First, read the file data using the fs.readFile method. Once you have the file data in a variable, you can convert it into an array using the following regular expression:
var regex = /"([^"]+)"\s*=>\s*"([^"]+)/g;
var match, results = {};
while((match = regex.exec(fileData)) !== null){
results[match[1]] = match[2];
}
console.log(results); // contains js array of data
See Fiddle.

PHP alternative of Javascript's pop() method [closed]

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Is there any PHP method to do:
var filename = $_POST["filename"];
filename = filename.split(".").pop();
How can I do the same above thing in PHP?

Something like this, perhaps?
$filetype = array_pop(explode('.',$filename));
It will generate an Only variables should be passed by reference notice. If you want to get rid of that, you'd need:
$fileparts = explode('.',$filename);
$filetype = array_pop($fileparts);
However, the best way to get a file's extension is by using pathinfo():
$filetype = pathinfo($filename, PATHINFO_EXTENSION);

You can do unset($filename[count($filename) - 1]);. Which will remove the last element in the array.

You'd want to do this:
$filename = $_POST['filename'];
$file_arr = explode(".",$filename); // may need to escape '.' here, can't remember
$filename = array_pop($file_arr);

In PHP, you probably don't need to convert to an array and pop; get the position of the last character, then get the rest of the string. From http://davidwalsh.name/php-file-extension:
substr(strrchr($file_name,'.'),1);

How to replace occurrences by key [closed]

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This is a simple question about JavaScript,
Say I got the following string:
A)My Name B)My Name C)My Name
now I give to a function the key #1 expecting to replace the second occurrence of My Name inside that function and return:
A)My Name B) C)My Name
I haven't found the solution to this anywhere online so I'm asking.

You could use split to separate the string into the parts, then join the before and after back together:
function removeNthMatch(input, removeString, removeIndex) {
var splitString = input.split(removeString);
result = splitString.slice(0, removeIndex + 1).join(removeString)
+ splitString.slice(removeIndex + 1).join(removeString);
}
input = "A)My Name B)My Name C)My Name";
removeString = "My Name";
removeIndex = 1;
console.log(removeNthMatch(input, removeString, removeIndex));