Scala Set forall() method with example

• Last Updated : 18 Oct, 2019

The forall() method is utilized to check if the given predicate satisfies all the elements of the set or not.

Method Definition: def forall(p: (A) => Boolean): Boolean

Return Type: It returns true if the stated predicate holds true for all the elements of the set else it returns false.

Example #1:

 `// Scala program of forall() ``// method `` ` `// Creating object ``object` `GfG ``{ `` ` `    ``// Main method ``    ``def` `main(args``:``Array[String]) ``    ``{ ``        ``// Creating a set ``        ``val` `s``1` `=` `Set(``3``, ``6``, ``12``, ``9``, ``21``) ``         ` `        ``// Applying forall method ``        ``val` `result ``=` `s``1``.forall(y ``=>` `{y ``%` `3` `==` `0``}) ``         ` `        ``// Displays output ``        ``println(result) ``     ` `    ``} ``} `

Output:

```true
```

Example #2:

 `// Scala program of forall() ``// method `` ` `// Creating object ``object` `GfG ``{ `` ` `    ``// Main method ``    ``def` `main(args``:``Array[String]) ``    ``{ ``        ``// Creating a set ``        ``val` `s``1` `=` `Set(``3``, ``7``, ``12``, ``9``, ``21``) ``         ` `        ``// Applying forall method ``        ``val` `result ``=` `s``1``.forall(y ``=>` `{y ``%` `3` `==` `0``}) ``         ` `        ``// Displays output ``        ``println(result) ``     ` `    ``} ``} `

Output:

```false
```

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