I am trying to make an Object with key as a number and value as an array of objects. How can this be done in javascript?
I want to create an object that looks like this:
{Key: "1", value: [Object, Object, ...], key: "2", value: [Object, Object, ...], key:"N", value: [Object, Object, ...]}
How is this possible in javascript/typescript ?
I tried:
let myObj = {};
myObj["1"] = myObj["1"].push(Object)
Above code does not work.
push returns the new length of the array - so just call the function (doing nothing with the return value), making sure you've initialized the target array first:
let myObj = {};
myObj["1"] = myObj["1"] || [];
myObj["1"].push(Object);
You could also define a custom type:
type objectContainingObjects = { [key: string]: object[] }
This is possible, and it can be achieved in a number of ways. For instance, to achieve what you require with TypeScript, you could do the following:
/* Define a type describing the structure of your desired object (optional)
*/
type CustomType = { [key: number]: Array<any> };
/* Create your object based on type definition with numbers as keys and array
of objects as values */
const yourObject: CustomType = {
1 : [1,2,3],
2 : ['a','b','c'],
3 : [ new Object(), new Object() ]
};
In JavaScript, the same can be achieved by omitting the typing:
const yourObject = {
1: [1, 2, 3],
2: ['a', 'b', 'c'],
3: [new Object(), new Object()]
};
console.log(yourObject);
/* Adding more letters to value at key 2 */
yourObject[2].push('d', 'e', 'f');
console.log(yourObject);Hope that helps!
.pushreturns a number, I don't think you want to assign a number tomyObj["1"]2) You can't have the same key twice, so your wanted datastructure is impossible to achieve (and senseless), maybe you want an array of objects?