Filtering by comparing two streams one-on-one in jq

I have streams

{
    "key": "a",
    "value": 1
}
{
    "key": "b",
    "value": 1
}
{
    "key": "c",
    "value": 1
}
{
    "key": "d",
    "value": 1
}
{
    "key": "e",
    "value": 1
}

And

 (true,true,false,false,true)

I want to compare the two one-on-one and only print the object if the corresponding boolean is true.

So I want to output

{
    "key": "a",
    "value": 1
}
{
    "key": "b",
    "value": 1
}
{
    "key": "e",
    "value": 1
}

I tried (https://jqplay.org/s/GGTHEfQ9s3)

filter:
. as $input | foreach (true,true,false,false,true) as $dict ($input; select($dict))

input:
{
    "key": "a",
    "value": 1
}
{
    "key": "b",
    "value": 1
}
{
    "key": "c",
    "value": 1
}
{
    "key": "d",
    "value": 1
}
{
    "key": "e",
    "value": 1
}

But I get output:

{"key":"a","value":1}
{"key":"a","value":1}
null
{"key":"b","value":1}
{"key":"b","value":1}
null
{"key":"c","value":1}
{"key":"c","value":1}
null
{"key":"d","value":1}
{"key":"d","value":1}
null
{"key":"e","value":1}
{"key":"e","value":1}
null

Help will be appreciated.

Solution

One way would be to read in the streams as arrays, use transpose to match their items, and select by one and output the other:

jq -s '[.,[(true,true,false,false,true)]] | transpose[] | select(.[1])[0]' objects.json

Demo

Another approach would be to read in the streams as arrays, convert the booleans array into those indices where conditions match, and use them to reference into the objects array:

jq -s '.[[(true,true,false,false,true)] | indices(true)[]]' objects.json

Demo

The same approach but using nth to reference into the inputs stream requires more precaution, as the successive consumption of stream inputs demands the provision of relative distances, not absolute positions to nth. A conversion can be implemented by successively checking the position of the next true value using index and a while loop:

jq -n 'nth([true,true,false,false,true] | while(. != []; .[index(true) + 1:]) | index(true) | values; inputs)' objects.json

Demo

One could also use reduce to directly iterate over the boolean values, and just select any appropriate input:

jq -n 'reduce (true,true,false,false,true) as $dict ([]; . + [input | select($dict)]) | .[]' objects.json

Demo

A solution using foreach, like you intended, also would need the -n option to not miss the first item:

jq -n 'foreach (true,true,false,false,true) as $dict (null; input | select($dict))' objects.json

Demo