I want to turn an array such as:
[[0,0], [1, 1], [2, 2]]
into
[{Duration: 0, Title: 0}, {Duration: 1, Title: 1}, {Duration: 2, Title: 2}]
I was thinking of doing something like:
var a = [[0,0], [1, 1], [2, 2]];
_.map(a, function() {return {Duration: , Title: } });
But I'm not able to reference the current value I'm looping at. What is the simplest way to do this?
The callback function is given a parameter, the current element (an array here):
_.map(a, function (data) {return {Duration: data[0], Title: data[1]} });
Update: to make dynamic keys
You could do this using the underscore function each, though I'm not really familiar with underscore:
var keys = ['Duration', 'Title'],
res;
res = _.map(a, function (data, dataIndex) {
var hashMap = {};
_.each(keys, function (key, keyIndex) {
hashMap[key] = data[keyIndex];
});
return hashMap;
});
Underscore's map function takes an array and returns a new array. You can map it how you want.
var a = [[0,0], [1, 1], [2, 2]];
var b = _.map(a, function(row) {
return { "Duration" : row[0], "Title" : row[1] };
})
If you want to do the fields dynamically, you could do this! Javascript is fun.
var a = [[0,0,4], [1, 1, 5], [2, 2, 6]];
var fields = ["Duration","Title","other"];
var b = _.map(a, function(row) {
return _.object(fields, row);
})
Here is a plunk you can fork to experiment for yourself.