检查javascript数组对象属性

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}]    

Answer 1

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); 

Answer 2

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

Answer 3

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

Answer 4

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)