I have an JSON obj:
{ 'A' : [1,2,3], 'B': [4,5,6], 'C': [7,8,9] }
I need to create multiple javascript arrays each to store
[1,2,3], [4,5,6], [7,8,9]
separately. The JSON obj can have many such entires as it depends on what returns from SQL database, so the arrays has to be created dynamically. Please tell how to do this.
Object.values()If support is not a problem, this can't be more concise!
const object = { A: [1,2,3], B: [4,5,6], C: [7,8,9] };
console.log(Object.values(object));Object.keys()If you need better browser support, I would use Object.keys() together with Array.prototype.map() (ES5 if you change the arrow function for a normal function and the const for a var):
const object = { A: [1,2,3], B: [4,5,6], C: [7,8,9] };
console.log(Object.keys(object).map(key => object[key]));for...inOtherwise, another approach with ES5 might be to use for...in. Longer to write, but probably faster (?)
var object = { A: [1,2,3], B: [4,5,6], C: [7,8,9] };
var listOfLists = [];
for (const key in object)
if (object.hasOwnProperty(key))
listOfLists.push(object[key]);
console.log(listOfLists);Object.keys() VS for...inAs stated in the docs, the difference between Object.keys() and for...in is that the former will not consider properties in the prototype chain (so you don't need the object.hasOwnProperty(key) check).
The
Object.keys()method returns an array of a given object's own enumerable properties, in the same order as that provided by afor...inloop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
object.A or object['A'], and you will get [1, 2, 3]. If you have a JSON string representation of it instead of an actual Object, you can convert it just by doing: const object = JSON.parse('{ "A" : [1,2,3], "B": [4,5,6], "C": [7,8,9] }')i hope this is what you want:
let obj = { 'A': [1, 2, 3], 'B': [4, 5, 6], 'C': [7, 8, 9] };
let result = Object.getOwnPropertyNames(obj).reduce(function(result, property) {
result.push(obj[property]);
return result;
}, []);
console.log(result);//[ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ]
the arrays has to be created dynamicallythat he saiddestructuring assignment:const [one, two, three] = [[1,2,3], [4,5,6], [7,8,9]];