As a child of head and in Flow content.
Values Let's get started with some strings: Notice that both strings are preserved exactly as is when they are put together so when we combine "hello" and "world" the result has no spaces.
Math looks normal too: The result will be True or False. Instead of wrapping all arguments in parentheses and separating them with commas, we use spaces to apply the function. So add 3,4 becomes add 3 4 which ends up avoiding a bunch of parens and commas as things get bigger. Ultimately, this looks much cleaner once you get used to it!
You can also define anonymous functions like this: After the arrow, Elm is just going to keep reading code as long as it can. The parentheses put bounds on this, indicating where the function body ends. This helps Elm know that 4 is an argument to the function. This is a possibly ill-conceived wink to the intellectual history that led to languages like Elm.
If Expressions When you want to have conditional behavior in Elm, you use an if-expression. If we try it out, Elm will tell us that we need to work with a real boolean value.
Now let's make a function that tells us if a number is over We use this in the definition of over above. Furthermore, it is best practice to always bring the body of a function down a line.
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It makes things a lot more uniform and easy to read, so you want to do this with all the functions and values you define in normal code. Make sure that you add a whitespace before the second line of the function. Elm has a "syntactically significant whitespace" meaning that indentation is a part of its syntax.
Lists Lists are one of the most common data structures in Elm.
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