What is different between isEmpty and isBlank in kotlin

Question

I want to check the value of a String in my in Android project. I saw two functions to check my String value:

item.isBlank()

and

item.isEmpty()

What is difference between them?

Answer 1

item.isEmpty() checks only the length of the the string

item.isBlank() checks the length and that all the chars are whitespaces

That means that

• " ".isEmpty() should returns false
• " ".isBlank() should returns true

From the doc of isBlank

Returns true if this string is empty or consists solely of whitespace characters.

Answer 2

In future, you can read documentation and see the code from IDE just click Ctrl+B or Command+B. This is written in documantation for isEmpty method:

/**
 * Returns `true` if this char sequence is empty (contains no characters).
 *
 * @sample samples.text.Strings.stringIsEmpty
 */
@kotlin.internal.InlineOnly
public inline fun CharSequence.isEmpty(): Boolean = length == 0

And for isBlank:

 * Returns `true` if this string is empty or consists solely of whitespace characters.
 *
 * @sample samples.text.Strings.stringIsBlank
 */
public actual fun CharSequence.isBlank(): Boolean = length == 0 || indices.all { this[it].isWhitespace() }