Spread syntax JavaScript MDN MDN Web Docs
Spread syntax The spread syntax allows an iterable such as an array or string to be expanded in places where zero or more arguments for function calls or elements for array literals are expected
Element append method Web APIs MDN MDN Web Docs, The Element append method inserts a set of Node objects or string objects after the last child of the Element String objects are inserted as equivalent Text nodes Differences from Node appendChild Element append allows you to also append string objects whereas Node appendChild only accepts Node objects
Adding object properties conditionally with ES6 Kevin Peters
Adding a property to an object is quite easy in JavaScript You can basically do it like in the following code 1 const person 2 firstName Max 3 4 person lastName But imagine the lastName should just be added if there is a specific conditional 1 const person 2 firstName Max 3 4 5 const condition getCondition 6 7
Object Keys Values and Entries JavaScript ES6 Feature Series Pt 9 , The method returns an array of a given object s own enumerable property names in the same order as we get with a normal for loop Example of Object keys on an object const resistanceFighter name John Connor age 30 title Resistance Leader fight return this name leads the resistance fight against the machines
Conditionally Add to an Object or Array in JavaScript DEV Community
Conditionally Add to an Object or Array in JavaScript DEV Community, Conditionally Add to an Object or Array in JavaScript Sept 7 2020 In the course of my work it s not uncommon that I need to conditionally add properties to objects or probably less commonly values to arrays Let s talk about how to do both This is the piece of code I ll refer to
JavaScript ES6 Sets
Set JavaScript MDN MDN Web Docs
Set JavaScript MDN MDN Web Docs A has method that takes an element and returns a boolean A keys method that returns an iterator of the elements in the set For example Map objects are set like because they also have size has and keys so they behave just like sets of keys when used in set methods js
Conditionally Add To An Object Or Array In JavaScript
JavaScript Modules Browser Support for ES6 2015 ES6 is fully supported in all modern browsers since June 2017 ES6 is not supported in Internet Explorer JavaScript let The let keyword allows you to declare a variable with block scope Example var x 10 JavaScript ES6 W3Schools. To create a new Map you use the following syntax let map new Map iterable Code language JavaScript javascript The Map accepts an optional iterable object whose elements are key value pairs Useful JavaScript Map methods clear removes all elements from the map object delete key removes an element specified by the key JavaScript as we know it has come a long way since its inception and ES6 represents a massive leap forward in terms of features and ease of use In this article we ll introduce you to the modern era of JavaScript development by exploring some of the most significant enhancements introduced in ES6
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