using find

by John Wick

JavaScript

/* var propertyNames = [
    {
        "id": "64c7cc0bbb946069e46a3695",
        "name": "Property1"
    },
    {
        "id": "64c7c07723b3b966cd7f5801",
        "name": "Property1"
    }
] 

const matchedPropertyName = propertyNames.find(item => item.id === id);

if (matchedPropertyName) {
    console.log(matchedPropertyName.name);
}

*/


var propertyNames = [
    [
        {
            "id": "64c7cc0bbb946069e46a3695",
            "name": "Property1"
        }
    ],
    [
        {
            "id": "64c7c07723b3b966cd7f5801",
            "name": "Property2"
        }
    ]
]

var id = "64c7cc0bbb946069e46a3695"

/* for (let i=0; i<propertyNames.length; i++) {
  if (propertyNames[i][0].id === id) {
    console.log(propertyNames[i][0].name)
  }
} */

const matchedPropertyName = propertyNames.find(itemArray => itemArray[0].id === id);



if (matchedPropertyName) {
    console.log(matchedPropertyName[0].name);
}