A regular expression is a sequence of characters that specifies a search or a pattern. Some of the functions are exec() and test(), in this js-pill we will see the basic functions and the groups property adventages.
This techniques can lock the array’s size, this is very useful to delete some elements of the array based on the number of elements you want to set.
How to check values with the && (AND) operator and the ?. (optional chaning) operator
This pill explain what a Prototype pollution is and how to prevent it
Short-circuit evaluation using logical AND (&&) and OR (||) operators to assing values
Semicolons are not required in JavaScript. This is because JavaScript has a feature called Automatic Semicolon Insertion
The assert module provides a set of assertion functions for verifying invariants.
We're presenting several ways to replace all the occurrences of a substring within a string in Javascript.
Do you want to make asynchronous request sequentially? Using async await can be tricky. Let's see why.
The `in` operator returns true if the specified property is in the specified object or its prototype chain.
Here are four ways to set a default value for a variable in JavaScript, each one of them with its pros and cons.
The `map()` method creates a new array with the results of applying a function on every element of an original array without mutating it.
Shuffling an array consists on randomly re-arrange the content of that structure. A simple and easy way to shuffle the elements of an array is the following:
Compose is a system design principle that allows us to dynamically comibine serveral funcions and returns the resut.
_A system is said to be **concurrent** if it can support two or more actions in progress at the same time. A system is said to be **parallel** if it can support two or more actions executing simultaneously._
Console methods explained
This is a collection of examples on how we can create an <b>array of consecutive numbers from 1 to n</b> in JavaScript, from the classic for loop to the ES6 Array class methods.
Objects in Javascript are references values, so you can't just copy using assing operator `=`
Remove falsy values from an array
JavaScript has a Boolean data type. It can **only** take the values true or false, like YES/NO or ON/OFF
This is a technique which involves converting a function which takes multiple arguments into a series of smaller cascaded functions which each take a single argument and return a function, except for the last cascaded function which returns the final result.
Different ways to remove duplicates from an array
This method tests if all the elements in array meets the condition in the provided function.
If you need to merge two arrays you can use the Array.concat()
The reduce() method executes a reducer function (that you provide) on each element of the array, resulting in single output value.