let names = ["Web", "DEV", "telegram"];

for (let i = 0, totalNames = names.length; i < totalNames; i = i + 1) {
  if (names[i] === "DEV") {
    console.log("%c found DEV", "color:red");
  }
}

let names = ["Web", "DEV", "telegram"];

let isRahulPresent = names.some(name => name === "DEV");

if (isRahulPresent) {
  console.log("%c found DEV", "color:red");
}