That’s right! These 20 one-liners will save you hours of coding and make your code cleaner, more efficient, and more professional. Whether you’re a beginner or a seasoned developer, these tricks will revolutionize the way you approach coding challenges. And the best part? They can all be written in just one line.
Removing duplicates from an array:
let unique = [...new Set(array)];
The line let unique = [...new Set(array)]; creates a new array with all duplicates removed from the original array. The Set object is used to store unique values of any type. When the Set is created from the array, it automatically removes all duplicates, because a Set can only contain unique values. Then, the spread operator (...) is used to spread the values of the Set back into a new array.
The benefits of this approach are:
Efficiency: Removing duplicates from an array can be done in a single line of code, making it a quick and efficient solution.
Readability: The code is concise and easy to understand, making it easier for other developers to read and maintain the code.
Flattening a nested array:
Imagine you have a collection of data stored in a nested array, with items nested within items, like a set of Russian nesting dolls. The problem is that you need to access each item individually, but the nested structure makes it difficult.
let flat = .concat(...nestedArray);
Enter the line
let flat = .concat(...nestedArray);. This line uses the concat method and the spread operator (...) to flatten the nested array and make it easier to work with.
Think of the concat method as a magic flattening tool that can take multiple arrays and combine them into one single, flat array. The spread operator is like a secret key that unlocks the contents of a nested array, spreading it out and making it accessible. When you combine these two tools, you have a powerful one-liner that can simplify even the most complex nested arrays.
So the next time you're faced with a challenging nested array, remember this one-liner. With it, you'll be able to transform your nested data into a clean and manageable flat array, just like the simple Russian nesting dolls of your childhood.
Checking if a string starts with a given substring:
Imagine you're building a web application and you need to check if a string starts with a certain substring. You could write a long and complicated function to do this, but why is waste time when you can do it in one line of code?
let startsWith = string.startsWith(substring);
This one-liner takes advantage of the
So, let's say you have a string "Hello World!" and you want to check if it starts with "Hello". Simply write:
let string = "Hello World!"; let substring = "Hello"; let startsWith = string.startsWith(substring); console.log(startsWith); // Output: true
With this one-liner, checking if a string starts with a substring has never been easier! Say goodbye to complicated functions and hello to cleaner, more efficient code.
Generating a random number between two values:
let random = Math.floor(Math.random() * (max - min + 1) + min);
Math.random()method. This method returns a random number between 0 and 1. But John realized that he needed to scale the number to fit within his desired range.
That's when John came up with the brilliant idea to use the
Math.floor() method. This method rounds down the number to the nearest integer. By multiplying
(max - min + 1) and adding min, John was able to generate a random number within the desired range.
let random = Math.floor(Math.random() * (max - min + 1) + min); became known as the one-liner for generating random numbers within a specific range.
Checking if a value is in an array:
Imagine you're working on a project where you need to check if a certain value is present in an array. You could write a for loop to manually iterate through the array and check each value, but that takes time and effort.
array: Array.includes(). With this method, you can easily find out if the value you're looking for is in the array.
So, you write the following code:
let isInArray = array.includes(value);
This line of code creates a variable isInArray and sets its value to the result of the
array.includes(value) method. If the value is present in the array, isInArray will be set to true. If not, isInArray will be set to false.
With this simple line of code, you can quickly and easily check if a value exists in an array, saving you time and effort. And that's the story of how
Array.includes() became your new best friend!