validate-array-example-4.js

// example # 4: Make sure that the passed-in object is an instance of the Array constructor

function processRecords (records) {
    if (!(records instanceof Array)) {
        console.log(`Array provided array not valid`);
        return;
    }

    if (!records.length) {
        console.log(`No records to process`);
        return;
    }
  
    records.forEach(record => {
      console.log(`The record is: ${record}`);
    });
}

processRecords({length: 3});
// Array provided array not valid