Javascript - Find single instance of a property's value in an array of objects

Question

Using array.protoype.some I am trying to find a single instance of a property's value '' in an array of objects. If the value ''is found then variable round will be 0. Here is the codepen http://codepen.io/theMugician/pen/meNeoJ?editors=101

$scope.cells = [ { value: '', disabled: false }, 
               { value: '', disabled: false },
               { value: '' , disabled: false}, 
               { value: '' , disabled: false },
               { value: '' , disabled: false},
               { value: '', disabled: false } ,
               { value: '' , disabled: false},
               { value: '', disabled: false }, 
               { value: '' , disabled: false} ];

function hasValue(element) {
    return element === '';
}

//check if all cells are filled
for(var i = 0; i < $scope.cells.length; i++){
    if($scope.cells[i].value.some(hasValue)){
        round = 0;
    }else{
        round = 1;
    }
}

What's in the array? Given a sample array of values, what output would you expect? If that information is already in the pen, then please include it here, the pen is a bonus but sufficient code to understand, and answer, the question is mandatory here on Tia site, in your question. — David Thomas
– David Thomas, Commented Nov 30, 2015 at 18:32
I need to loop through every object in $scope.cells and check the property value: of each object. If there is a single instance of '' in the property value then variable round = 0 else (if there is no '' in the property value in any of the objects) then round = 1 — Grzes Slania
– Grzes Slania, Commented Nov 30, 2015 at 18:42

JstnPwll · Accepted Answer · 2015-11-30 18:27:31Z

2

Array.protoype.some must be called on an array. You're calling it on $scope.cells[i].value, so it throws an error.

Try removing the for loop, and simply calling some on the array:

function hasValue(element) {
  return element.value === "";
}

if($scope.cells.some(hasValue)){
  round = 0;
}else{
  round = 1;
}

edited Nov 30, 2015 at 18:27

answered Nov 30, 2015 at 18:22

JstnPwll

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1 Comment

Grzes Slania Over a year ago

It was simpler than I thought. I should have added the property .value in the function hasValue rather than trying to execute it with array.some which it can't.

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