_.where collection filter function about lodash HOT 9 CLOSED

@sgarbesi and anyone else seeking example code:

var people = [
  { name: "Tom", age: 19 },
  { name: "John", age: 3 },
  { name: "Seven", age: 37 },
  { name: "John", age: 42 }
];

var filtered_people = _.filter(people, function(p){
  return _.includes(['Tom', 'John'], p.name);  
});

console.log(filtered_people); // Array[3]

from lodash.

Specifying multiple filter object properties does a logical AND. For example, {name: "John", age: 3} says "find all items which have both name === "John" AND age === 3." You could achieve the same result by chaining multiple _.where calls, eg.

var littleJohn = _(people).chain().where({name: "John"}).where({age: 3}).value();

Why not make the "passing multiple keys" option a logical OR in that case, where {name: "John", age: 3} would say "find all items which have both name === "John" OR age === 3."

Or is that unintuitive?

from lodash.

This was created from an existing implementation:

http://backbonejs.org/#Collection-where

Seems to work well here and the use cases would suggest logical AND not OR.

from lodash.

Closing until a pull request.

from lodash.

Related to Underscore issue #648.

from lodash.

Also unit tests here.

from lodash.

@jdalton Is it possible to do a multi-value where without having to write a manual loop?

Ex:

var people = [
  { name: "Tom", age: 19 },
  { name: "John". age: 3 },
  { name: "Seven", age: 37 },
  { name: "John", age: 42 }
];

_.where(people, {
  name: ['Tom', 'John']
});

Results being the 1st, 2nd and 3rd members of the Array?

from lodash.

@sgarbesi

Is it possible to do a multi-value where without having to write a manual loop?

Not with the _.matches shorthand as that would try to match an array value. You'd have to create a callback and use _.filter.

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This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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