nested function scope

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Mon Apr 29 2024 08:36:24 GMT+0000 (Coordinated Universal Time)

Saved by @davidmchale #functions #nesting #scope

function firstFunction() {
  // parent function
  const x = 100; // parent variable / cant be used inside the child function

  function secondFunction() {
    const y = 60; // child variable / cannot be called in the parent function
    return y + x; // return calculation to the child function
  }

  return secondFunction(); // evoke the second function by returning it to the parent function
}

console.log(firstFunction()); // call the parent function

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@davidmchale

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#javascript #javascript #functions #parameters

Required Parameters for Functions in JavaScript

 const isRequired = () => { throw new Error('param is required'); };

const hello = (name = isRequired()) => { console.log(`hello ${name}`) };

// These will throw errors
hello();
hello(undefined);

// These will not
hello(null);
hello('David');
The idea here is that it uses default parameters, like how the b parameter here has a default if you don’t send it anything:
function multiply(a, b = 1) {
  return a * b;
}

#python #dates #functions #python3.8

How to parse a String into Datetime in Python

from datetime import datetime

datetime_object = datetime.strptime('Jun 1 2005  1:33PM', '%b %d %Y %I:%M%p')

#python #python #iterator #functions

Using an iterator function to build a list

#In computer programming, an iterator is an object that enables a programmer to traverse a container, particularly lists.
# define function:
1.def unfold(fn, seed):
  2.def fn_generator(val):
    3.while True: 
      4.val = fn(val[1])
     5.-5 if val == False: break
      6.yield val[0]
  7.return [i for i in fn_generator([None, seed])]
EXAMPLES
f = lambda n: False if n > 50 else [-n, n + 10]
unfold(f, 10) # [-10, -20, -30, -40,

#php #functions

SVG upload

function add_file_types_to_uploads($file_types){
$new_filetypes = array();
$new_filetypes['svg'] = 'image/svg+xml';
$file_types = array_merge($file_types, $new_filetypes );
return $file_types;
}
add_action('upload_mimes', 'add_file_types_to_uploads');

#php #wordpress #functions #documentation #prority

add_action in wordpress

https://developer.wordpress.org/reference/functions/add_action/

#javascript #object #functions

7 JavaScript Functions to Master Objects Manipulation and Make Your Code Cleaner | Medium

https://medium.com/@giuliamalaroda/7-javascript-functions-to-master-objects-manipulation-and-make-your-code-cleaner-cc142a269b13

#functions

Obfuscated Code in functions.php: Your theme's core files might contain:

PHP
$global_var = '...long string of random characters...'; 
eval(base64_decode($global_var));

#functions #nesting #scope

nested function scope

function firstFunction() {
  // parent function
  const x = 100; // parent variable / cant be used inside the child function

  function secondFunction() {
    const y = 60; // child variable / cannot be called in the parent function
    return y + x; // return calculation to the child function
  }

  return secondFunction(); // evoke the second function by returning it to the parent function
}

console.log(firstFunction()); // call the parent function

#functions #iffe #self

IFFE function

// iffe function
(function () {
  //Your code goes here
})();




// adding params to the IFFE

(function (name) {
  console.log(`Greetings ${name}`);
})("David");

nested function scope

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