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FROM node:10 WORKDIR /usr/src/app COPY package*.json ./ RUN npm install pm2 -g RUN npm install COPY . . EXPOSE 8080 CMD ["pm2-runtime", "server.js"] |
Node.js 12: Private Class Fields
Javascript allows us to declare fields inside the class. We can access its own fields or properties by creating an instance of a class. Example:
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Class Devreto { postId = 1; } const devreto = new Devreto(); devreto.postId ; //1 |
PHP 7.4 – Null coalescing assignment operator
The null coalescing assignment operator is a shorthand for null coalescing operations. Let’s take a example code
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$data['date'] = $data['date'] ?? new DateTime(); |
PHP 7.4 – Arrow functions
Arrow functions also called “short closures”. We can always access the parent scope, there’s no need for the use keyword. Here is a simple example with an arrow function.
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$items = [1,2,3,4,5]; $factor = 10; array_map(fn ($item) => $item * $factor, $items) |
Eloquent – A better way to increment or decrements an int
Laravel has in-built increment() and decrement() functions to increase or decrease a value of the column, by 1 or with the given number. Below are the examples:
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User::find($user_id)->increment('post_count'); |
Difference between two dates in JavaScript
Let us see an example of how to calculate the difference between dates using Javascript. First, write an HTML code with Javascript as below:
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const d1 = new Date("12/12/2018"); const d2 = new Date("12/12/2020"); const timeDiff = d2.getTime() - d1.getTime(); const DaysDiff = timeDiff / (1000 * 3600 * 24); console.log("Days of difference between:"+ d1 +"<br> and "+d2+" is:" +DaysDiff); |
Laravel Drop all tables
This is useful for migrations when you can’t rollback. It can easily be run in artisan mode or you can create a console command.
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foreach(\DB::select('SHOW TABLES') as $table) { $table_array = get_object_vars($table); \Schema::drop($table_array[key($table_array)]); } |
PHP 7.4 – Numeric Literal Separator
PHP 7.4 allows for underscores to be used to visually separate numeric values. It looks like this:
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$unformattedNumber = 123456789.78; $formattedNumber = 123_456_789.78; |
