Loop through arrayObjects with condition Javascript

Question

I found a nice example on here showing how to look through arrayObjects with a condition but I have a question.

As is stands its console.logging every time it the condition is false. Is it possible to only console.log once when its finished looping through everything.

var arrayObjects = [{
    "building": "A",
    "status": "good"
  },
  {
    "building": "B",
    "status": "horrible"
  }
];

for (var i = 0; i < arrayObjects.length; i++) {
  console.log(arrayObjects[i]);

  for (key in arrayObjects[i]) {

    if (key == "status" && arrayObjects[i][key] == "good") {

      console.log(key + "->" + arrayObjects[i][key]);
    } else {
      console.log("nothing found");
    }
  }
}

yes, just add an extra variable to that keeps track of whether you found any item or not — UnholySheep
– UnholySheep, Commented Oct 23, 2021 at 19:01
Create a new array of the output (what you would normally log) After the loops, log the array. — Heretic Monkey
– Heretic Monkey, Commented Oct 23, 2021 at 19:07
Do you need print all objects with they statuses, all with good status or only first object with good status? Plaese, add output as what you expect. — A1exandr Belan
– A1exandr Belan, Commented Oct 23, 2021 at 19:25

GMKHussain · Accepted Answer · 2021-10-23 19:09:41Z

1

Simply use .length with if condition.

var arrayObjects = [{
    "building": "A",
    "status": "good"
  },
  {
    "building": "B",
    "status": "horrible"
  }
];

for (var i = 0; i < arrayObjects.length; i++) {
  console.log(arrayObjects[i]);

  if( i === arrayObjects.length-1 ) {
      console.log("nothing found");
  }
}

answered Oct 23, 2021 at 19:09

GMKHussain

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2 Comments

Ian Barber Over a year ago

Using the length with the if condition appeared to be the easiest one for me to understand the logic so I used this. Thanks to all for your input, very much appreciated

A1exandr Belan Over a year ago

But nothing found will print anyway. There is no condition on object.status is it good or horrible

Burakhan Aksoy · Accepted Answer · 2021-10-23 19:08:42Z

I'm assuming that you want it to print Nothing found when nothing's really found, not even a single thing..

Then, you can try this.


var arrayObjects = [{"building":"A", "status":"good"}, 
{"building":"B","status":"horrible"}];

var isFound = false;

 for (var i=0; i< arrayObjects.length; i++) {
  console.log(arrayObjects[i]);

   for(key in arrayObjects[i]) {

  if (key == "status" && arrayObjects[i][key] == "good") {
      isFound = true
      console.log(key + "->" + arrayObjects[i][key]);
  }
 }
}

if (isFound === false){
      console.log("nothing found");
  }

Steven Spungin · Accepted Answer · 2021-10-23 19:13:59Z

1

You can use the some or filter method of array.

var arrayObjects = [{"building":"A", "status":"good"}, 
{"building":"B","status":"horrible"}];

const found = arrayObjects.some(it => it.status === 'good')
if (found) {
  console.log('found')
}

const items = arrayObjects.filter(it => it.status === 'good')
if (items.length) {
  console.log('found')
}

answered Oct 23, 2021 at 19:13

Steven Spungin

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Comments

PsiKai · Accepted Answer · 2021-10-23 23:33:30Z

1

If you're willing to refactor you code, you can save on time complexity by using just one loop with Array.reduce()

var arrayObjects = [{
    "building": "A",
    "status": "good"
  },
  {
    "building": "B",
    "status": "horrible"
  }
];
const foundKeys = arrayObjects.reduce((bool, key) => {
    console.log(key)
    if (key.status === "good") {
      console.log("status ->", key.status);
      bool = true
    }
    return bool 
}, false)

if (!foundKeys) {
    console.log("Nothing found")
}

edited Oct 23, 2021 at 23:33

answered Oct 23, 2021 at 19:10

PsiKai

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Comments

A1exandr Belan · Accepted Answer · 2021-10-24 09:04:56Z

Another declarative way solution:

const arrayObjects = [
  { "building": "A", "status": "good" },
  { "building": "B", "status": "horrible" },
];

const checkCondition = (arr, key = 'status', value ='good') => {
  const result = arr.find((obj) => obj[key] === value);
  return result 
    ? `${key} -> ${result[key]}` 
    : "nothing found";
};

console.log(checkCondition(arrayObjects));                  //status -> good
console.log(checkCondition(arrayObjects, 'building', 'B')); //building -> B
console.log(checkCondition(arrayObjects, 'building', 'C')); //nothing found

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