If it doesn t find anything after iterating through all of the elements it returns nil.
Ruby array select first n elements.
The select method works in a similar way but it constructs a new array containing all of the elements that match.
Array indexing starts at 0 as in c or java.
If the last expression in the block evaluates to true the find method returns the value and stops iterating.
This will do the same thing as the first example in the introduction but with a lot less code.
The take n method returns the first n elements of the array.
So to retrieve the first element from our emails array we append the element s index to the variable using square brackets like this.
To access a specific item or element of an array you reference its index or its position in the array.
When a size and an optional default are sent an array is created with size copies of default take notice that all elements will reference the same object default.
Returns the first element or the first n elements of the array.
If the array is empty the first form returns nil and the second form returns an empty array.
In the first form if no arguments are sent the new array will be empty.
The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter.
Ruby array select collect map methods.
The take while method passes elements to the block until the block returns nil or false then stops iterating and returns an array of all prior elements.
A negative index is assumed relative to the end of the array that is an index of 1 indicates the last element of the array 2 is the next to last element in the array and so on.
In ruby indexes start at zero.
Ruby arrays can hold objects such as string integer fixnum hash symbol even other array objects.
Hammerhead find executes the block you provide for each element in the array.
See also array last for the opposite effect.
1 2 3 4 5 6 select n n even.
