I have the following array:
[{object}, {object}, {object}]
Each object looks something like:
{key0: 3, key1: undefined, key2: 7}
I want to filter the array for undefined properties so that each object in the array now looks like:
{key0: 3, key2: 7}
I've tried everything with Lo_Dash and I'm thinking I must be going crazy.
What code do you have written right now?
You could do something like this:
_.each(array, function(item, index, collection){
collection[index] = _.filter(item, function(value){
return value !== undefined;
});
});
This will iterate over the array, then filter each object in the array.
EDIT:
If you'd like to maintain the array elements as objects, you can use _.reduce instead. IE:
_.each(array, function(item, index, collection){
collection[index] = _.reduce(item, function(result, value, key){
if(value !== undefined) { result[key] = value; }
return result;
}, {});
});
_.reduce instead of _.filter then. See my edit.This is the approach that I would take. Use filter on your array and check for all the undefined props in a loop. Then simply delete them from your object. I just looked and another poster noted this. I've included the hasOwnProperty check as well.
var data = [{
key0: 3,
key1: undefined,
key2: 7
}, {
key0: 4,
key1: undefined,
key2: 8
}, {
key0: 5,
key1: undefined,
key2: 9
}];
function removeUndefined(obj) {
for (var prop in obj) {
if (obj.hasOwnProperty(prop) && obj[prop] === undefined) {
// do stuff
delete obj[prop];
}
}
return obj;
}
var filtered = data.filter(removeUndefined);
console.log(filtered);
In LoDash you can use a combination of map + omit:
objs = _.map(objs, function(x) {
return _.omit(x, _.isUndefined)
})
You can loop through all properties and remove undefined properties using the "delete" keyword.
var myObj = {key0: 3, key1: undefined, key2: 7};
for (var i in myObj) {
if (myObj[i] === undefined) {
delete myObj[i];
}
}
hasOwnProperty check, but I suppose that's really up to the OP.