PHP

function default value

function multiply(a, b = 1) {
  return a * b
}

multiply(5, 2)          // 10
multiply(5)             // 5
multiply(5, undefined)  // 5

Using Default Values

//Using Default Values
//Default values can be assigned
//to the variables just in case the value extracted from the array is undefined.


var[greeting = "hi",name = "Sarah"] = ["hello"];

    console.log(greeting);//"Hello"
    console.log(name);//"Sarah"