I have a very basic implementation of a sleep function which resolves a promise after x miliseconds: I then need to render a React component in an ES6 Stateful Class Component after the sleep, but this sadly throws the error: Objects are not valid as a React child. Is there something wrong with this generator…
Tag: ecmascript-6
Create object from array
I want to create an object from a list inside an array. I have an array which is dynamic and supposed to look like this: var dynamicArray = [“2007”, “2008”, “2009”, “2010”]; And I want to make an object like this with some JavaScript ES6: Don’t worry about…
Alternative version for Object.values()
I’m looking for an alternative version for the Object.values() function. As described here the function is not supported in Internet Explorer. When executing the following example code: It works in both, Firefox and Chrome, but throws the following error in IE11: Object doesn’t support property or…
eslint: error Parsing error: The keyword ‘const’ is reserved
I am getting this error from ESLint: from this code: I’ve tried removing node_modules and reinstalling all npm packages (as suggested here), but to no avail. Answer ESLint defaults to ES5 syntax-checking. You’ll want to override to the latest well-supported version of JavaScript. Try adding a .esl…
How to use generator function in typescript
I am trying to use generator function in typescript. But the compiler throws error error TS2339: Property ‘next’ does not exist on type Below is an closest sample of my code. Here is the playground link for the same Answer The next method exists on the generator that the function returns, not on t…
update array of object without mutation
I’m following a react tutorial but I’m lost. I don’t understand starting line 9. so I tried to make a little miarature https://jsbin.com/sifihocija/2/edit?js,console but failed to produce the result that the author did, what’s wrong? Answer Issue is in this line: const index = list.fin…
Using _ (underscore) variable with arrow functions in ES6/Typescript
I came across this construct in an Angular example and I wonder why this is chosen: I understand that the variable _ means don’t care/not used but since it is the only variable is there any reason to prefer the use of _ over: Surely this can’t be about one character less to type. The () syntax con…
Javascript set const variable inside of a try block
Is it possible in ES6 to set a variable inside of a try{} using const in strict mode? This fails to lint because configPath is defined out of scope. The only way this seems to work is by doing: Basically, is there any way to use const instead of let for this case? Answer Declaring a variable as const requires
What is the purpose of the script scope?
When inspecting scopes of a function in the DevTools console I noticed a “script” scope. After a bit of research it seems to be created for let and const variables. Scopes of a function in a script without const or let variables: Scopes of a function in a script with a let variable: Yet the follow…
ES6 deep nested object destructuring
I have an object called this.props which contains statement contains I would like to extract statement object and the isConfirmed property in the same line using es6 destructuring I’ve tried which I get an error when I do let a = isConfirmed, b = statement Answer I would like to extract statement object…