Use this tag for questions about features finalized in ECMAScript 2017. Do *not* use this tag if the code in question merely *uses* one of the features, *unless* the feature is cause of the problem.
Proposals finalized in 2017 include:
Questions tagged [ecmascript-2017]
387 questions
0
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1 answer
how ES7 import module's object in Node.js
var GoogleStrategy = require('passport-google-oauth20').Strategy;
How can I use ES2017's way to write it? I try
import GoogleStrategy from ('passport-google-oauth20').Strategy
But it couldn't work
How can I use ES7 to write it?
Thanks
here is the…
user20345646
0
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0 answers
How to upgrade es2017 to es2020 without upgrading angular version?
I want to upgrade es2017 to es2020, but I don't want to upgrade angular version. Is it possible? My angular version is 5.2.
erzen
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1 answer
How to throw "expressive" / console friendly exceptions in JavaScript?
JavaScript noob here... I'm exploring various options for throwing exceptions.
Throwing a string / primitive value
This seems to be bad practice for several reasons (catching, stacktrace, ...)
Using Error
throw new Error("bad times")
This seems to…
aioobe
- 413,195
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2 answers
ECMAScript 8, async await, syntactical errors javascript
using more then one async() in a chain in the function breaks my function.
Is there a way i can include Key2pkcs8() inside generateKey() ?
async function generateKey() {
let getKeyPair = await crypto.subtle.generateKey(
{
name: "ECDH",
…
cubesareneat
- 302
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- 14
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0 answers
How to determine the goal symbol when tokenize ECMAScript in lexical grammar
I'm writing a JS macro preprocessor, and refer to the ECMA-262 specification for some guide to parse js code.
I use the code parser to determine where to do macro replace in a standard/precise way, which will distinguish some environments…
Lane Sun
- 13
- 4
0
votes
3 answers
How to find repeated values and store repeated values into new array in javascript
I am trying to implement a logic where I have an array [3,4,63,5,5,1,5,2,63,2,4,5,6,2,4,56,74,2,671,1,4,5,7,3,6] . I want to find all repeated elements and I want to store these all repeated elements into a new array. I tried very hard but didn't…
Jonas
- 71
- 8
0
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1 answer
How to make a separate a sync function wait for another async function?
I am unable to callback async function inside of another async function.
I am receiving this in the console:
Promise {}
__proto__: Promise
[[PromiseState]]: "fulfilled"
[[PromiseResult]]: Object
script.js:127 TypeError: Cannot read…
captaincustard
- 321
- 2
- 12
0
votes
1 answer
Transform/map json to another format
Have long JSON object and small part is below:
const valueObject = {zipCode: 12345, street1: 'street 1', street2: 'street 2',city:'cityname', uniqueNum: '123456789'};
const mappingObject = {address: {pinCode: zipCode, addressLine1: 'street1',…
TechS
- 167
- 1
- 5
- 14
0
votes
1 answer
TypeError: Cannot read property 'onMouse' of undefined React Class Component
I want to do when the user clicks on Input Element and the button element in the form will change to Send icon from the microphone icon. My idea was to get the value from onClick or mouseEnter handler and pass it through the if-else statement and…
Chizi56 HappyCity
- 49
- 5
0
votes
1 answer
Why does Number.parseInt('111AAA') works like its supposed to in JS ? What is the reasoning behind this behaviour?
If I execute parseInt('111AAA') we get the output '111'. In javascript why does parseInt work as its mentioned in the MDN docs.
The parseInt function converts its first argument to a string, parses
it, and returns an integer or NaN. If not NaN, the…
slick
- 65
- 8
0
votes
1 answer
es6/7 shorthand for assigning properties from object to HTMLElement
What would be a shorthand for the following:
setupIframeConfig(element: HTMLIFrameElement, config: IFrameConfig){
element.src = config.src;
element.width = config.width;
element.width = config.width;
}
using rest wont do it because it…
Tomas Katz
- 1,653
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0
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2 answers
ES2017 NEST JS @IsEmpty Unable to resolve signature of property decorator when called as an expression.This expression is not callable. is not empty
Hi people im newer with Nest JS and i trying to add dto validator but for example when i tried to add isNotEmpty or Max compiler show me this error:
Unable to resolve signature of property decorator when called as an
expression. This expression…
Daniel ORTIZ
- 2,488
- 3
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- 41
0
votes
2 answers
Turn callback to promise and using of `await`
I've found this sample snippets in this article :