Andrew French

1607471820

A Functional, Rule-based Authorisation Module for Deno

authz

A deno module that provides a functional interface for defining action, object, and field-level authorisation rules.

No dependencies, 100% test coverage.

Usage

Creating an authoriser

import {
  and,
  create,
} from "https://raw.githubusercontent.com/joelshepherd/authz/main/mod.ts";

const authoriser = create({
  action: {
    read: () => true,
    write: (context) => context.role === "writer",
  },
  object: {
    // read falls back to action-level
    write: and(
      (context) => context.role === "writer",
      (context, post) => context.user === post.user
    ),
  },
});

Using an authoriser

if (authoriser(context, "write")) {
  // user can perform write
}

if (authoriser(context, "write", object)) {
  // User can perform write on this object
}

if (authoriser(context, "write", object, "name")) {
  // User can perform write on this object's name field
}

Rule and other helpers

const allRules = and(...rules);
const anyRule = or(...rules);
const notRule = not(rule);

const boundAuthoriser = bind(context, authoriser);
boundAuthoriser("read"); // no need to specify the context anymore

Download Details:

Author: joelshepherd

Source Code: https://github.com/joelshepherd/authz

#deno #nodejs #javascript #node

What is GEEK

Buddha Community

A Functional, Rule-based Authorisation Module for Deno
Vincent Lab

Vincent Lab

1605017502

The Difference Between Regular Functions and Arrow Functions in JavaScript

Other then the syntactical differences. The main difference is the way the this keyword behaves? In an arrow function, the this keyword remains the same throughout the life-cycle of the function and is always bound to the value of this in the closest non-arrow parent function. Arrow functions can never be constructor functions so they can never be invoked with the new keyword. And they can never have duplicate named parameters like a regular function not using strict mode.

Here are a few code examples to show you some of the differences
this.name = "Bob";

const person = {
name: “Jon”,

<span style="color: #008000">// Regular function</span>
func1: <span style="color: #0000ff">function</span> () {
    console.log(<span style="color: #0000ff">this</span>);
},

<span style="color: #008000">// Arrow function</span>
func2: () =&gt; {
    console.log(<span style="color: #0000ff">this</span>);
}

}

person.func1(); // Call the Regular function
// Output: {name:“Jon”, func1:[Function: func1], func2:[Function: func2]}

person.func2(); // Call the Arrow function
// Output: {name:“Bob”}

The new keyword with an arrow function
const person = (name) => console.log("Your name is " + name);
const bob = new person("Bob");
// Uncaught TypeError: person is not a constructor

If you want to see a visual presentation on the differences, then you can see the video below:

#arrow functions #javascript #regular functions #arrow functions vs normal functions #difference between functions and arrow functions

Andrew French

1607471820

A Functional, Rule-based Authorisation Module for Deno

authz

A deno module that provides a functional interface for defining action, object, and field-level authorisation rules.

No dependencies, 100% test coverage.

Usage

Creating an authoriser

import {
  and,
  create,
} from "https://raw.githubusercontent.com/joelshepherd/authz/main/mod.ts";

const authoriser = create({
  action: {
    read: () => true,
    write: (context) => context.role === "writer",
  },
  object: {
    // read falls back to action-level
    write: and(
      (context) => context.role === "writer",
      (context, post) => context.user === post.user
    ),
  },
});

Using an authoriser

if (authoriser(context, "write")) {
  // user can perform write
}

if (authoriser(context, "write", object)) {
  // User can perform write on this object
}

if (authoriser(context, "write", object, "name")) {
  // User can perform write on this object's name field
}

Rule and other helpers

const allRules = and(...rules);
const anyRule = or(...rules);
const notRule = not(rule);

const boundAuthoriser = bind(context, authoriser);
boundAuthoriser("read"); // no need to specify the context anymore

Download Details:

Author: joelshepherd

Source Code: https://github.com/joelshepherd/authz

#deno #nodejs #javascript #node

Tia  Gottlieb

Tia Gottlieb

1598258520

Activation Functions, Optimization Techniques, and Loss Functions

Activation Functions:

A significant piece of a neural system Activation function is numerical conditions that decide the yield of a neural system. The capacity is joined to every neuron in the system and decides if it ought to be initiated (“fired”) or not, founded on whether every neuron’s info is applicable for the model’s expectation. Initiation works likewise help standardize the yield of every neuron to a range somewhere in the range of 1 and 0 or between — 1 and 1.

Progressively, neural systems use linear and non-linear activation functions, which can enable the system to learn complex information, figure and adapt practically any capacity speaking to an inquiry, and give precise forecasts.

Linear Activation Functions:

**Step-Up: **Activation functions are dynamic units of neural systems. They figure the net yield of a neural node. In this, Heaviside step work is one of the most widely recognized initiation work in neural systems. The capacity produces paired yield. That is the motivation behind why it is additionally called paired advanced capacity.

The capacity produces 1 (or valid) when info passes edge limit though it produces 0 (or bogus) when information doesn’t pass edge. That is the reason, they are extremely valuable for paired order studies. Every rationale capacity can be actualized by neural systems. In this way, step work is usually utilized in crude neural systems without concealed layer or generally referred to name as single-layer perceptions.

#machine-learning #activation-functions #loss-function #optimization-algorithms #towards-data-science #function

Rusty  Bernier

Rusty Bernier

1593272100

Where Can I find Deno Third Party Modules?

As we explore the Deno ecosystem, we need to know where we can locate third party modules.

#deno #modules

Madyson  Reilly

Madyson Reilly

1601069940

Function Expression vs Function Declaration in JavaScript

Function Expression vs Function Declaration in JavaScript.

It was until during one of the JavaScript mock interviews did I came across the term function expression.

The question was: What is the difference between these two syntax?

function x(){

}

let x = function(){

}

I was clueless for a moment. After thinking a little, I could only come up with: the second syntax invokes an _anonymous _function and is assigned to a variable.

I was alien to the term hoisting.

In this article, we will acquaint ourselves with three simple terms: function declaration,_ function expression, _and hoisting.

What is function declaration?

Function declaration is also known as _function statement. _It contains the name of the function, parameters, and a return statement. **Naming the function **is what sets function declaration apart. Parameters and return statement is optional.

Image for post

Function Declaration

What is function expression?

Function expression also has a name, parameters, and return statement. All of which are optional. The important thing to bear in mind is: the function here is _assigned _to a JavaScript variable.

Image for post

Function Expression

#function-expression #function-declaration #functions-in-javascript #coding #javascript #express