ECMAScript 6 Articles

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ECMAScript 6

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Why does destructuring on boolean is working in javascript?

why destructuring a boolean is working. For example const condition = true const toto = … Read more Why does destructuring on boolean is working in javascript?

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Filter object by key value to get keys of of all affected objects

In my data object, there are multiple objects – optional with some dependency data. First … Read more Filter object by key value to get keys of of all affected objects

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I can’t understand why it returns undefined [duplicate]

I am trying to add 2 to given array. But the code returns undefined when … Read more I can’t understand why it returns undefined [duplicate]

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How JavaScript store unstored values?

I am trying to write a code using ES6 iterators : let numbers = [100,200,300]; … Read more How JavaScript store unstored values?

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Jest – how to mock a function which is invoked in module creation

I have a function which is called on module creation, and I’d like to ensure … Read more Jest – how to mock a function which is invoked in module creation

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Jest – how to mock a function which is invoked in module creation

I have a function which is called on module creation, and I’d like to ensure … Read more Jest – how to mock a function which is invoked in module creation

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Improve ES6 Syntax in React

I’m calling a function called goGet when clicking a button and I wanted to improve … Read more Improve ES6 Syntax in React

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Reading response from async/await pattern in try/catch block

I’m making an API request using the async/await pattern in a try/catch block.. async myRequest(data) … Read more Reading response from async/await pattern in try/catch block

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Why can’t I use this function with setState inside a .map function?

featList = ProductData.featureList.map((item)=> { return( <button onClick={this.onWatchClick}>{item}</button> ) }) onWatchClick () { console.log("click") this.setState((prevState) =>{ … Read more Why can’t I use this function with setState inside a .map function?

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Previewing video before file upload in React

i try to upload a video in react-js and preview but i am faild i … Read more Previewing video before file upload in React

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Bot won’t join voice channel

I have a problem where I’ve joined a voice channel and I want to play … Read more Bot won’t join voice channel

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Jest: whats the diff between jest.fn() and jest.fn().mockImplementation()

jest.fn(() => ‘something’) jest.fn().mockImplementation(() => ‘something’) Is there any difference between these? bit confused. Source: … Read more Jest: whats the diff between jest.fn() and jest.fn().mockImplementation()

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Concatenating a string in a forEach loop js

Iā€™m trying some tester code I turn a string into UpperCase Then split it to … Read more Concatenating a string in a forEach loop js

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How can i separate key/value in different array object in js?

I have this in my code: let obj = {EdadBeneficiario1: ’32’, EdadBeneficiario2: ‘5’} var years … Read more How can i separate key/value in different array object in js?