I have a large, multidimensional array of JSON objects that I want to map through (using Underscore). For example:
var dummyData = [
[{title: 'a'},{title : 'b'}],
[{title: 'a'},{title : 'b'}],
[{title: 'a'},{title : 'b'}],
[{title: 'a'},{title : 'b'}]
];
For the function body of the _.map, I want to run each JSON object through a Backbone Model constructor. So far, I've tried something like this to accomplish this:
_.map(dummyData, function() {
_.each(dummyData, function(el, i) {
// run each object through the constructor
}
})
I'm getting caught up on the _.each, though - since dummyData isn't actually the 'list' that I want to loop through.
Or am I thinking about this wrong altogether?
Iterate over the elements of dummyData, with _.map like this
_.map(dummyData, function(currentDummyData) {
return _.map(currentDummyData, function(el, i) {
// run each object through the constructor
})
});
dummyData is an Array of Arrays. When you use _.map with that, it picks up each array in the array of arrays and passes to the function, which we accept with function(currentDummyData) {..}.
Inside that function, we again _.map that array, because it is still an array. So, we iterate that to get individual elements and pass them to the function function(el, i) {..}, where new Backbone models are created.
Note: You have to return the result of _.map, like in the answer. Because, _.map expects the function called to return an object and all the returned objects will be gathered to create a new array.
For example,
console.log(_.map(dummyData, function(currentDummyData) {
return _.map(currentDummyData, function(el, i) {
return {title: el.title + el.title};
})
}));
will produce
[ [ { title: 'aa' }, { title: 'bb' } ],
[ { title: 'aa' }, { title: 'bb' } ],
[ { title: 'aa' }, { title: 'bb' } ],
[ { title: 'aa' }, { title: 'bb' } ] ]
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