class Test{
constructor(private Name: string, private Id: number, private isAlive: boolean){}
array1?: string[];
}
Imagine that the array is initialized with a bunch of data from an API response. I have an array of Test objects. What I now need is to extract the Name of all those objects in that array into a new array. I could not find typescript syntax for this problem.
Typescript is (more or less) a superset of javascript. The same solution for Javascript would apply to Typescript.
const output = input.map( item => item.name );
What I now need is to extract the Name of all those objects in that array into a new array
Use Array.prototype.map : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
From Name[] you want string[]:
const array1: string[] = names.map(x=>x.fieldThatIsTheStringYouWant);
var originalObject = [
{"first":"Gretchen","last":"Kuphal","email":"[email protected]","address":"416
Lesch Road","created":"March 1, 2012","balance":"$9,782.26"}];
1.you want to copy array simply
var duplicateObject = originalObject;
duplicateObject[0].first
alert(duplicateObject[0].first);
Editrd This can be done also
var originalObject = [
{"first":"Gretchen","last":"Kuphal","email":"[email protected]","address":"416 Lesch Road","created":"March 1, 2012","balance":"$9,782.26"},
{"first":"Morton","last":"Mayer","email":"[email protected]","address":"1602 Bernhard Parkway","created":"April 29, 2017","balance":"$6,596.11"},
{"first":"Catalina","last":"Daugherty","email":"[email protected]","address":"11893 Kali Vista","created":"October 16, 2008","balance":"$6,372.86"},
{"first":"Orpha","last":"Heaney","email":"[email protected]","address":"8090 Chris Stream","created":"November 21, 2015","balance":"$9,596.26"},
{"first":"Reva","last":"Mohr","email":"[email protected]","address":"0291 Kailyn Stravenue","created":"November 6, 2014","balance":"$4,768.37"},
{"first":"Loma","last":"Keeling","email":"[email protected]","address":"84460 Samson Knoll","created":"June 13, 2017","balance":"$9,361.16"}
];
var duplicateObject=new Array();
for (let num of originalObject) {
duplicateObject.push(num.first);
}
// print
for (let first of duplicateObject) {
console.log(first);
}
