const addresses = [...]; // Some array I got from async call
const uniqueAddresses = Array.from(new Set(addresses.map(a => a.id)))
.map(id => {
return addresses.find(a => a.id === id)
})
Here is what the above code is Doing:
1. Create a Set from the addresses array.
2. Map the Set to an array of unique addresses.
3. Return the array of unique addresses.
var window.iAmGlobal = “some val”; //Global variable declaration with window. //Any place in other part of code function doSomething() { alert(window.iAmGlobal); //I am accessible here too !! //OR alert(iAmGlobal); //I am accessible here too !! } Here is what the above code is Doing: 1. We are declaring a global variable iAmGlobal. 2. We are…
{{item.key}}:{{item.value}} Here is what the above code is Doing: 1. We are using the keyvalue pipe to iterate over the object. 2. We are using the *ngFor directive to iterate over the keyvalue pipe. 3. We are using the key and value properties of the keyvalue pipe to display the key and value of the…
db.listCollections().toArray(function(err, collections){ //collections = [{“name”: “coll1”}, {“name”: “coll2″}] }); Here is what the above code is Doing: 1. Connect to the database 2. Create a collection called “myCollection” 3. Insert a document into the collection 4. Find all documents in the collection 5. Find all collections in the database
window.location.hash = ‘new-route’; Here is what the above code is Doing: 1. We’re using the window.location.hash property to get the current hash value. 2. We’re using the window.location.hash property to set the current hash value.
function ListItem(props) { // Correct! There is no need to specify the key here: return {props.value};} function NumberList(props) { const numbers = props.numbers; const listItems = numbers.map((number) => // Correct! Key should be specified inside the array. ); return ( {listItems} ); } const numbers = [1, 2, 3, 4, 5]; ReactDOM.render( , document.getElementById(‘root’) );…