Check javascript array of objects property

Question

I have the following javascript array of objects ,I need to check output property if at least one object is true return true else return false,Can anyone help me to implement that?

var array=[{"id":100,"output":false},{"id":100,"output":false},
{"id":100,"output":true}]

Possible duplicate of How to loop through an array containing objects and access their properties — Turnip
– Turnip, Commented Oct 11, 2016 at 11:45
use Array.prototype.some should stop the iteration once one value is found and return a Boolean — Endless
– Endless, Commented Oct 11, 2016 at 11:45

Nina Scholz · Accepted Answer · 2016-10-11 11:47:00Z

11

You could use Array#some

The some() method tests whether some element in the array passes the test implemented by the provided function.

var array = [{ "id": 100, "output": false }, { "id": 100, "output": false }, { "id": 100, "output": true }];
    result = array.some(function (a) { return a.output; });

console.log(result);

edited Oct 11, 2016 at 11:47

answered Oct 11, 2016 at 11:46

Nina Scholz

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Comments

Robiseb · Accepted Answer · 2016-10-11 11:48:53Z

1

function hasOneTrue(a){
  return !!a.filter(function(v){
    return v.output;
  }).length;
}

var array = [{"id":100,"output":false}, {"id":100,"output":false}, {"id":100,"output":true}]
console.log(hasOneTrue(array)); // true

answered Oct 11, 2016 at 11:48

Robiseb

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2 Comments

Maxx Over a year ago

you filter all array objects even if true in first. better use some()

Robiseb Over a year ago

@Maxx I agree :)

spitterfly · Accepted Answer · 2016-10-11 11:50:01Z

0

You could Loop over the array and check every property.

var array = [
    {"id":100,"output":false},
    {"id":100,"output":false},
    {"id":100,"output":true}
];

function testOutput ( array ) {
    for (el in array)
        if ( el.output ) return true;

    return false;
}

testOutput (array);

Best Regards

answered Oct 11, 2016 at 11:50

spitterfly

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Comments

Endless · Accepted Answer · 2016-10-11 11:59:13Z

0

fastest + most compatible

var result = false
var json = [{"id":100,"output":false},{"id":100,"output":false},{"id":100,"output":true}]

for(
  var i = json.length;
  !result && i;
  result = json[--i].output
);

console.log("at least one? ", result)

answered Oct 11, 2016 at 11:59

Endless

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