Check if the value of a variable exists in an object

Question

I have a Typescript project where I need to know if the value of a variable is in any property of the Object.

This is the object:

let listDump = [
   {
     "properties":{
        "title":"CARS"
     }
  },
  {
     "properties":{
        "title":"HOME"
     }
  },
  {
     "properties":{
        "title":"COUNTRY"
     }
  }
];

This is the declared variable:

let newData = 'ANIMALS'

This is what I do to check if it exists:

for (let sheet of listDump) {
  if (sheet.properties.title == newData) {
    console.log(`do not create property`)
  } else {
    console.log('create property') 
  }
}

Problem : Doing three checks operates three times on the else

What I need to know is how to check that it exists without needing to iterate over the object and operate only once in case it doesn't exist

Answer 1

You can use <Array>.some

listDump.some(sheet => sheet.properties.title == newData) // returns true | false