Understand that ES2015 Map keys are compared (almost) as if with the === operator. Two array instances, even if they contain the same values, do not ever compare as === to each other. Try this: var a = new Map(), key = [‘x’, ‘y’]; a.set(key, 1); console.log(a.get(key)); Since the Map class is intended to be … Read more
You can use map to iterate the data and check for the fieldName, if fieldName is cityId then you need to change the value and return a new object otherwise just return the same object. Write it like this: var data = [ {fieldName: ‘title’, valid: false}, {fieldName: ‘description’, valid: true}, {fieldName: ‘cityId’, valid: false}, … Read more
Your class has no static variables (if by static variable you mean static property). getCount returns NaN (after you call increaseCount) because Animal has no count property initially. Then increaseCount does undefined + 1 which is NaN. Instances created by new Animal have a count property initially, but Animal itself does not until you call … Read more
I was not able to find any method to get last value inserted in set from ECMA 2015 Specification, may be they never intended such a method, but you can do something like: const a = new Set([1, 2, 3]); a.add(10); const lastValue = Array.from(a).pop(); Edit: on second thought, a space efficient solution might be: … Read more
Option 1 Name your export instead of using default. It should look like this // add.js export const add = (a, b) => a + b; // OR // export const add = function(a, b) { return a+b }; // app.js import { add } from ‘./add’; Option 2 Use the export default syntax. It … Read more
All async functions return a promise. All of them. That promise will eventually resolve with whatever value you return from the async function. await only blocks execution internal to the async function. It does not block anything outside of the function. Conceptually, an async function starts to execute and as soon as it hits an … Read more
What you provide to style attribute should be an object. Since we write js code in jsx between curly braces, you ll insert an object there. Remember, you need to camelCase all css props. ( font-size ==> fontSize ) <img src={this.state.photo} alt=”” style={ isLoggedIn ? { display:’block’} : {display : ‘none’} } /> or <img … Read more
The problem occurs because you aren’t calling the debounce function, you could do in the following manner export default class componentName extends Component { constructor(props) { super(props); this.state = { value: this.props.value || null } this.servicesValue = _.debounce(this.servicesValue, 1000); } onChange(value) { this.setState({ value }); this.servicesValue(value); } servicesValue = (value) => { Services.setValue(value) } render() … Read more
I was just looking for the same thing and found this VSCode extension: move-ts It is very young, but seems to be under active development. I tested it on my Windows machine and immediately ran into an issue with backslashes being used. There is, however, already a pull request to fix this (not by me). … Read more
I went through this and I’ve a solution with a third js file as module. rectangle.js will be same and myHifiRectangle.js file have only one modification. import Rectangle from ‘./rectangle.js’; export default class MyHiFiRectangle extends Rectangle { constructor(height, width) { super(height,width); this.foo= “bar”; } } Now, we need a third file which will be a … Read more