{"id":12587,"date":"2018-04-07T05:17:44","date_gmt":"2018-04-07T05:17:44","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=12587"},"modified":"2021-12-04T10:16:40","modified_gmt":"2021-12-04T04:46:40","slug":"scala-for-loop","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/scala-for-loop\/","title":{"rendered":"Scala for loop – Types, Syntax and Example of For loop"},"content":{"rendered":"

Sometimes, in your code, you may want to execute a set of statements for, say, 100 times. Would you type them a hundred times? Obviously not. This is where loops come in. A loop lets us execute a group of statement a set number of times, or until an expression becomes false.<\/p>\n

In this lesson, we will see the Scala for loop with its syntax and examples. Along with this, we will discuss different types of for loop in Scala.<\/p>\n

So, let’s start Scala For Loop Tutorial.<\/p>\n

\"Scala<\/a>

Scala for loop with Syntax and Examples<\/p><\/div>\n

Learn: Loop Control statement in Scala<\/a><\/strong><\/p>\n

What is For Loop in Scala?<\/h3>\n

Scala for loop lets us execute specific code a certain number of times. It is a control structure in Scala, and in this article, we\u2019ll talk about the forms of for-loop we have here.<\/p>\n

A syntax of Scala For Loop<\/h3>\n

Let\u2019s first check out the syntax for Scala for Loop.<\/p>\n

for(var x <- Range){\r\nstatement(s);\r\n}<\/pre>\n
The arrow pointing leftward is a generator; it generates individual values from a range. Range is a range of numbers; we may use a list for this. We can also represent this as i to j<\/i>, or as i until j<\/i>.<\/p>\n
Types of For loops in Scala<\/h3>\n
There are four types of Scala For Loop:<\/p>\n
a. i to j<\/h4>\n
Let\u2019s take an example to demonstrate the syntax for i to j.<\/p>\n
object Main extends App {\r\n    var a=7\r\n    for(a<-1 to 10)\r\n    {\r\n        println(a)\r\n    }\r\n}<\/pre>\n
Here\u2019s the output:
\n1
\n2
\n3
\n4
\n5
\n6
\n7
\n8
\n9
\n10
\nLearn: While loop in Scala<\/a><\/strong><\/p>\n
b. i until j<\/h4>\n
The other syntax we talked about is the until-syntax. Here\u2019s an example:<\/p>\n
object Main extends App{\r\n    var a=0\r\n    for(a<-1 until 10)\r\n    {\r\n        println(a)\r\n    }\r\n}<\/pre>\n
c. Using Multiple Ranges in Scala for loop<\/h4>\n
We can use multiple ranges in a Scala for loop. For this, we just separate the ranges with semicolons(;).<\/p>\n
object Main extends App{\r\n    var a=0\r\n    var b=0\r\n    var c=0\r\n    for(a<-1 until 3;b<-7 to 9;c<-12 until 15)\r\n    {\r\n        println()\r\n        println(a)\r\n        println(b)\r\n        println(c)\r\n    }\r\n}<\/pre>\n
What would the output be? Combinations of all values:
\n1
\n7
\n12<\/p>\n
1
\n7
\n13<\/p>\n
1
\n7
\n14<\/p>\n
1
\n8
\n12<\/p>\n
1
\n8
\n13<\/p>\n
1
\n8
\n14<\/p>\n
1
\n9
\n12<\/p>\n
1
\n9
\n13<\/p>\n
1
\n9
\n14<\/p>\n
2
\n7
\n12<\/p>\n
2
\n7
\n13<\/p>\n
2
\n7
\n14<\/p>\n
2
\n8
\n12<\/p>\n
2
\n8
\n13<\/p>\n
2
\n8
\n14<\/p>\n
2
\n9
\n12<\/p>\n
2
\n9
\n13<\/p>\n
2
\n9
\n14
\nLearn: do-while loop in Scala<\/a><\/strong><\/p>\n
d. Using Collections<\/h4>\n
We can also use a collections object to provide values to the for-loop to iterate on. Let\u2019s take an example with a list.<\/p>\n
object Main extends App{\r\n    var a=0\r\n    val odds=List(1,3,5,7,9)\r\n    for(a<-odds)\r\n    {\r\n        println(a)\r\n    }\r\n}<\/pre>\n
The output:
\n1
\n3
\n5
\n7
\n9<\/p>\n
e. Using Filters<\/h4>\n
Adding extra if-conditions can let us filter out values from a collection.<\/p>\n
object Main extends App{\r\n    var a=0\r\n    val odds=List(1,3,5,7,9,11,13,15,17,19)\r\n    for(a<-odds\r\n        if a>3; if a<15)\r\n    {\r\n        println(a)\r\n    }\r\n}<\/pre>\n
And the output:
\n5
\n7
\n9
\n11
\n13<\/p>\n
Learn: Scala if-else statement<\/a><\/strong><\/p>\n
f. Scala for loop Yield<\/h4>\n
The last option is to return a value from a Scala\u00a0for loop, and store it in a variable. We can also return it from a function. Then, we follow this by a yield statement. Note the curly braces.<\/p>\n
object Main extends App{\r\n    var a=0\r\n    val odds=List(1,3,5,7,9,11,13,15,17,19)\r\n    var ret=for{a<-odds\r\n        if a>3; if a<15} yield a\r\n    for(a<-ret)\r\n    {\r\n        println(a)\r\n    }\r\n}<\/pre>\n
And the output is:
\n5
\n7
\n9
\n11
\n13<\/p>\n
Conclusion<\/h3>\n
These are the ways we can implement for loop\u00a0in Scala. Try your own questions, and ask us your doubts in the comments section.<\/p>\n
Reference<\/a><\/strong>
Sometimes, in your code, you may want to execute a set of statements for, say, 100 times. Would you type them a hundred times? Obviously not. This is where loops come in. A loop...<\/p>\n","protected":false},"author":6,"featured_media":31238,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[12459,12460,12461,12462,12463],"class_list":["post-12587","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scala","tag-scala-for-loop-array","tag-scala-for-loop-break","tag-scala-for-loop-multiple-variables","tag-scala-for-loop-with-index","tag-scala-for-loop-yield"],"yoast_head":"\nScala for loop - Types, Syntax and Example of For loop - DataFlair<\/title>\n<meta name=\"description\" content=\"Scala for loop: Learn for loops in Scala, Types of Scala for-loop, i to j, i until j, Using Multiple Ranges in Scala for loop with syntax & examples\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/scala-for-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scala for loop - 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