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Scala immutable TreeSet diff() method
• Last Updated : 19 Apr, 2020

In Scala immutable TreeSet class the diff() method is used to find the difference between the two TreeSet. It deletes elements that are present in one TreeSet from the other one.

Method Definition: def diff[B >: A](that: collection.Seq[B]): TreeSet[A]

Return Type: It returns a new TreeSet which consists of elements after the difference between the two given TreeSet.

Example #1:

 `// Scala program of diff()  ` `// method  ` ` `  `// Import TreeSet ` `import` `scala.collection.immutable.``_` ` `  `// Creating object  ` `object` `GfG  ` `{  ` ` `  `    ``// Main method  ` `    ``def` `main(args``:``Array[String])  ` `    ``{  ` `     `  `        ``// Creating TreeSet ` `        ``val` `t``1` `=` `TreeSet(``1``, ``2``, ``3``, ``4``, ``5``)   ` `           `  `        ``val` `t``2` `=` `TreeSet(``3``, ``4``, ``5``)   ` `           `  `        ``// Print the TreeSet  ` `        ``println(``"TreeSet_1: "` `+ t``1``)  ` `           `  `        ``println(``"TreeSet_2: "` `+ t``2``)  ` `           `  `        ``// Applying diff method   ` `        ``val` `result ``=` `t``1``.diff(t``2``)   ` `           `  `        ``// Displays output   ` `        ``print(``"(TreeSet_1 - TreeSet_2): "` `+ result)  ` `         `  `    ``}  ` `}  `

Output:

```TreeSet_1: TreeSet(1, 2, 3, 4, 5)
TreeSet_2: TreeSet(3, 4, 5)
(TreeSet_1 - TreeSet_2): TreeSet(1, 2)
```

Example #2:

 `// Scala program of diff()  ` `// method  ` ` `  `// Import TreeSet ` `import` `scala.collection.immutable.``_` ` `  `// Creating object  ` `object` `GfG  ` `{  ` ` `  `    ``// Main method  ` `    ``def` `main(args``:``Array[String])  ` `    ``{  ` `     `  `        ``// Creating TreeSet ` `        ``val` `t``1` `=` `TreeSet(``1``, ``2``, ``3``, ``4``, ``5``)   ` `           `  `        ``val` `t``2` `=` `TreeSet(``3``, ``4``, ``5``, ``6``, ``7``, ``8``)   ` `           `  `        ``// Print the TreeSet  ` `        ``println(``"TreeSet_1: "` `+ t``1``)  ` `           `  `        ``println(``"TreeSet_2: "` `+ t``2``)  ` `           `  `        ``// Applying diff method   ` `        ``val` `result ``=` `t``2``.diff(t``1``)   ` `           `  `        ``// Displays output   ` `        ``print(``"(TreeSet_2 - TreeSet_1): "` `+ result)  ` `         `  `    ``}  ` `}  `

Output:

```TreeSet_1: TreeSet(1, 2, 3, 4, 5)
TreeSet_2: TreeSet(3, 4, 5, 6, 7, 8)
(TreeSet_2 - TreeSet_1): TreeSet(6, 7, 8)
```

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