const is a signal that the variable won’t be reassigned. let is a signal that the variable may be reassigned Additional things to ponder: Use const by default Use let only if rebinding is needed const does not indicate that a value is ‘constant’ or immutable. const foo = {}; foo.bar = 10; console.log(foo.bar); // … Read more
What that is basically saying is that the else part of the if statement is unnecessary if there is a return in the if part. Something like this is what it expects: if (cctot <= 3 && cctot > 0) { alert(‘Credit under $3.00 not allowed’); return Number.MIN_SAFE_INTEGER; // important to return 0 so we … Read more
My solution is to not use this at all, but use the variables that are passed to the callback function. The first one is the index and the second one gives you the DOM element itself. let mediaBoxes = $(‘.now-thumbnail’); let titles = []; mediaBoxes.each((index, element) => { let obj = { index: index, title: … Read more
You have to use filter at this context, let names= [“Style”,”List”,”Raw”]; let results= names.filter(x => x.includes(“s”)); console.log(results); //[“List”] If you want it to be case insensitive then use the below code, let names= [“Style”,”List”,”Raw”]; let results= names.filter(x => x.toLowerCase().includes(“s”)); console.log(results); //[“Style”, “List”] To make it case in sensitive, we have to make the string’s character … Read more
You can resolve this by: Just add js as an extension to file Before: import std from ‘./route/student’ After: import std from ‘./route/student.js’
There is no practical difference. An arrow allows to skip return keyword, but cannot benefit from hoisting. This results in less verbose output with ES6 target but more verbose output when transpiled to ES5 , because a function is assigned to a variable: var MyMainComponent = function MyMainComponent() { return React.createElement( “main”, null, React.createElement(“h1”, null, … Read more
Here’s another more generic way of doing this. Requiring a module by ID The current version of WebPack exposes webpackJsonp(…), which can be used to require a module by ID: function _requireById(id) { return webpackJsonp([], null, [id]); } or in TypeScript window[‘_requireById’] = (id: number): any => window[‘webpackJsonp’];([], null, [id]); The ID is visible at … Read more
But I have declared that var in the top of the other files. That’s the problem. After all, this makes multiple declarations for the same name in the same (global) scope – which will throw an error with const. Instead, use var, use only one declaration in your main file, or only assign to window.APP … Read more
I would say that you should, as a principle, use let whenever it is not inconvenient to do so. Such as: for (let i = 0; i < 100; i++) { // Do something } if (condition) { let msg = a + b + c; console.log(msg); alert(msg); } The advantages to this approach is: … Read more
ES6 Template literals (Template strings) cannot be used inside an Angular component input, because the Angular compiler doesn’t know this grammar. The way that you provided is fine. <app-my-component [myInput]=”‘My name is ‘ + name + ‘!'”></app-my-component> Or something like this, In the component, // In the component, you can use ES6 template literal name: … Read more