I want to create the object of list that looks like this:
myObj = {"foo":[1,2,3,4],
"bar":[3,5,7,8]}
I tried this but failed
var myObj = new Object();
myObj["foo"].push(1)
myObj["foo"].push(2)
#...etc
What's the right way to do it?
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You have to initialize your object's properties as array before they've got the push methodKaiido– Kaiido2015-09-15 01:52:48 +00:00Commented Sep 15, 2015 at 1:52
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5 Answers
You need to create the array first
myObj["foo"] = []
then call your push method
Comments
It depends, are you trying to reassign the myObj attribute foo with a completely new array? Or are you trying to append to the already existing array?
In the former case:
myObj.foo = [1,5,6,4] // new array
And in the latter:
myObj.foo.concat(/*new numbers*/)
Comments
The {} notation is commonly used.
var myObj = {};
myObj.foo = [];
myObj.bar = [];
Later you can manipulate the arrays.
myObj.bar.push('elem1');
myObj.bar.pop();
// ...
Comments
First you should declare the properties of the object as array in order not to get some unpleasent situations.So you can use new Object to create an object like this.
var myObj=new Object;
and define properties as empty arrays
myobj.prop1=[];
myObj.prop2=[];
then you can push whatever you want into prop1 or prop2 by simply reaching them inside the object as
myObj.prop1.push(someData)
OR
You can use a better way to declare this object like below
var myObj={
prop1:[],
prop2:[]
}
And again you can push whatever you like into them as i told above as myObj.prop1.push(data)
Comments
Try first declare your object, so your second line goes first
var myObj = new Object();
then you fill your object with data
myObj = {"foo":[1,2,3,4],"bar":[3,5,7,8]}
then the rest of your code should work fine
myObj["foo"].push(1)
myObj["foo"].push(2)
result [ 1, 2, 3, 4, 1, 2 ]
