I need to filter an array so it would remove undefined objects from it.
I tried with lodash _.filter but didn't succeed (returned completely empty array)
_.filter(myArray, _.isEmpty)
I'm using Angular 6 so anything with typescript or lodash would be perfect.
Using Javascript also feasible. it supports null,undefined, 0, empty.
newArray = myArray.filter(item=> item);
The more simple way
_.filter(myArray, function(o) { return o !== undefined });
You don't need a library; the Javascript array type has a filter method:
var filteredArray = myArray.filter(item => item !== undefined);
In filter function of lodash if the callback (you passed as argument) return truthy value that element considered to be retained in resultant array otherwise (in case return falsy) it will not retain that element. Your isEmpty return true if it is Empty and thus the result retains those values (null, undefined, 0, ...). So you can either use
_.filter(myArray, _.negate(_.IsEmpty)) or _.filter(myArray, v => !_.IsEmpty(v))
In the way you are trying
Or, you can directly use _.filter(myArray) but in this case it will not remove empty object or empty array as same like _.filter(myArray, Boolean), passing Boolean is not necessery in case of using lodash
in case you don't want to negate and want a simpler solution for removing all the empty element, then you can use
_.reject(myArray, _.isEmpty)
var newArray = array.filter(arrayItem => arrayItem)
It will Filtering array so it would remove all undefined objects and assign to new variable called newArray
