The with() operator in Kotlin

There are times when there’s multiple lines of operations on the same object, and we do it by calling myObject instance everytime we do any operation. This makes our code repetitive and makes it look bad and ugly.



For example, when we put different values in the Intent, we do it like this:

    var intent = Intent()
    intent.putExtra("myInt", 0)
    intent.putExtra("myBool", false)
    intent.putExtra("myString", "hello string")
    startActivity(intent)

And when we receive this Intent in any other Activity, then we get all the values like this:

    var intent = getMyIntent()
    var myInt = intent.getInt("myInt", 0)
    var myBool = intent.getBoolean("myBool", false)
    var myString = intent.getString("myString")

Again, same ugly repetitive code block. Kotlin provides a better solution to this problem by using with operator. We can write above codes like this now:

    var intent = Intent()
    with(intent)
    {
        putExtra("myInt", 0)
        putExtra("myBool", false)
        putExtra("myString", "hello string")
    }
    startActivity(intent)

See! How clean this is. Similarly, we can use it at receiving Intent as well:

    var intent = getMyIntent()
    with(intent)
    {
        var myInt = getInt("myInt", 0)
        var myBool = getBoolean("myBool", false)
        var myString = getString("myString")
    }


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Wajahat Karim
🌍 Making the world a better place, one app at a time.
🔥 Google Developer Expert (GDE) in Android . 📱 Professional Android Developer with ~7 years experience. 💻 Creator of various Open Source libraries on Android . 📝 Author of two technical books and 100+ articles on Android. 🎤 A passionate Public Speaker giving talks all over the world.
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Wajahat Karim

🔥 Google Dev Expert (GDE) in Android .
📱 Android Dev. 💻 Open Source Contributor . 📝 Technical Writer . 🎤 Public Speaker

Senior Android Developer

Karachi, Pakistan