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PHP 7.0

All features.

• Scalar type declarations: function f(int ...$args) (bool, int, float and string, in addition to array, callable, self, parent and interface/class name).
• Return type declarations: function f(): bool.
• Constant arrays using define(): define('MY_CONSTANT', [ ... ]).
• Integer division with intdiv(): var_dump(intdiv(8, 3)); // int(3).
• Spaceship operator: $a <=> $b → {-1, 0, 1} (less, equal, bigger).
• Null coalescing operator:

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// See: wp-includes/js/api-request.js

// Returns a jqXHR object. See: https://api.jquery.com/jQuery.ajax/#jqXHR
wp.apiRequest({path: '/namespace/vendor/v1/config'})
    .then(configOptions => console.log(configOptions));

// jqXHR object has method then(), but does not have methods catch() or
// finally(). Use fail() or always() instead
wp.apiRequest({path: '/namespace/vendor/v1/config'})
    .done(configOptions => console.log(configOptions))

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Q: How to build both minified and uncompressed bundle with Webpack?

A1: Use plugin UglifyJsPlugin (before webpack 4)

let webpack = require("webpack");

module.exports = {
    entry: {
        'bundle': './entry.js',
 'bundle.min': './entry.js'

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Less is more

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NOTE: This gist is a translation from an article by Marcos Douglas. Here is the original version, in Brazilian Portuguese: http://objectpascalprogramming.com/posts/menos-e-mais/.

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Have you ever wondered what would be the ideal quantity of arguments in a method? And how about the number of methods on an interface or class? And how many classes would you put inside a single unity?