How to find index of an object by key and value in an javascript array

Question

Given:

var peoples = [
  { \"attr1\": \"bob\", \"attr2\": \"pizza\" },
  { \"attr1\": \"john\", \"attr2\": \"sushi\" },
  { \"attr1\": \"lar         


        

Answer 1

If you want to check on the object itself without interfering with the prototype, use hasOwnProperty():

var getIndexIfObjWithOwnAttr = function(array, attr, value) {
    for(var i = 0; i < array.length; i++) {
        if(array[i].hasOwnProperty(attr) && array[i][attr] === value) {
            return i;
        }
    }
    return -1;
}

to also include prototype attributes, use:

var getIndexIfObjWithAttr = function(array, attr, value) {
    for(var i = 0; i < array.length; i++) {
        if(array[i][attr] === value) {
            return i;
        }
    }
    return -1;
}