Ruby Splat Operator

Attr reader title author category that s the power of the splat operator matching operator what is this funny looking ruby. It can be used for hashes. The double splat operator came out back in ruby 2 0.

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In other words the last example translates to.

Ruby splat operator.

Def doublesplat nums p numsenddoublesplat one. Method in the object referred to by variable a is called with b as its argument. The splat operator converts the array into a list of its elements. The split mode.

Zoo pet1 pet2 pet3 the splat operator can be used in a case statement. Ruby supports a rich set of operators as you d expect from a modern language. Case when with splat operator use instructions like duparray concatarray which result in creation of arrays. Splat operator in ruby.

One of the things that i love about ruby is the depth of its features. The humble splat operator and is a great example. So it would be like taking away the array replacing it with everything inside it. There is a corresponding form of abbreviated assignment operator.

2 one 1 two 2 putting it all together. Here s an example for the most basic use of a double splat. Avoiding creation of array improves performance. For example a plus.

The splat operator can be used to create methods that accept a variable number of arguments. You ve probably used splats for catch all arguments. It s pretty similar to the original splat with one difference. Most operators are actually method calls.

For each operator plus. In one of my recent posts someone pointed out that using the splat operator would have made some of the code a bit simpler. As of ruby 1 9 you can do some pretty odd things with array destructuring and splatting. B is interpreted as a plus b where the plus.

Pet1 pet2 pet3 duck dog cat the collect mode. This article has been republished on monkey and crow. Here is how to create a method that adds a variable number of numbers passed as arguments. Putting the star before an object invokes the splat operator which has a variety of effects first we ll start with some very useful examples then we will poke around the dark corners of ruby s arrays and the splat operator.

You may use an operator but do a little digging and you ll find that you ve only been scratching the surface of what it s capable of. I ve seen the splat operator being used in method definitions to group remaining arguments but it turns out there are actually quite a few other uses as well.