adding a set of sets in a key value pair array

Question

I have a simple function declared like this:

foo(data){
    ....
}

I am trying to call the function by sending it a key value like so:

foo({
    A : {{1, 2}, {3, 4}}
});

But I keep getting the following error from my ide (netbeans)

Expected indent but found {
        A : {{1, 2}, {3, 4}}
             ^

Expected an operand but found ,
        A : {{1, 2}, {3, 4}}
                   ^

What am I doing wrong?

Where did you get the `{1, 2}` syntax from? That doesn't exist in JS. Arrays: `[1,2,3]`, objects: `{foo: 42}`. I recommend to read a tutorial to learn about basic JS syntax: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Predefined_Core_Objects#Creating_an_Array, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects#Using_object_initializers — Felix Kling, Jun 09 '14 at 00:42
FYI, if you want an object that implements sets in javascript, see [here](http://stackoverflow.com/questions/7958292/mimicking-sets-in-javascript/7958422#7958422). — jfriend00, Jun 09 '14 at 02:06

Jephron · Answer 1 · 2014-06-09T01:26:10.847

0

A : {{1, 2}, {3, 4}} doesn't make any sense. In JavaScript {} creates a key-value store, also known as a JavaScript object. Every element inside of a JavaScript object must be a key-value pair. To store a simple list/array, use []

foo({
    A : [[1, 2], [3, 4]]
});

edited Jun 09 '14 at 01:26

answered Jun 09 '14 at 00:41

Jephron

2,652
1
23
34

`[{1, 2}, {3, 4}]` doesn't make sense either. – Felix Kling Jun 09 '14 at 00:42
Indeed it doesn't. *facepalm* – Jephron Jun 09 '14 at 00:42
yes thanks It works, I thought `{}` was a set syntax and `[]` was a list. My bad – Krimson Jun 09 '14 at 00:44
1

@Krimson: Sets don't exist in JS (at least not yet). – Felix Kling Jun 09 '14 at 00:45

adding a set of sets in a key value pair array

1 Answers1