Here s the code to pull just the names.
Ruby print array of hashes.
To create a new hash you have two possiblities.
Since ruby 1 9 hashes maintain the order in which they re stored.
Creates a new hash inverting keys and values from hash.
Creates a new array with keys from hash.
When writing deep complex code you may need to pull the values or keys out of your hash and use it.
In past versions of ruby you could not rely on hashes maintaining order.
The fact that we can use square brackets and commas in order to define arrays and curly braces and hash rockets in order to define hashes is part of ruby s syntax.
In this article we will explore their syntax how to combine functionalities of both to create an array of hashes retrieve values and loop through them.
In ruby a hash is a collection of key value pairs.
Returns the size or length of hash as an integer.
A note on hash order.
A hash is denoted by a set of curly braces which contains key value pairs separated by commas each value is assigned to a key using a hash rocket calling the hash followed by a key name within brackets grabs the value associated with that key.
Hashes hashes are another way to store multiple values inside a variable.
That is in the new hash the keys from hash become values and values become keys.
So if an array contained three elements the indexes for those elements would be array 0 array 1 and array 2.
Because it s returning an array you can do interesting things like printing out all the keys in a hash.
Hashes represented by curly brackets store information in key value pairs.
Hashes and arrays in ruby arrays and hashes are data structures that allow you to store multiple values at once.
In an array you don t have any control over the indexes.
Bed chair desk simple as that.
They are numbers and they go up by one with each item starting from 0.
In a hash you provide key value pairs where the key doesn t have to be a number.
Name and age keys each k puts k.
Instead of checking array 0 to get the value at a particular index you would check hash key to get the value at that index.
Today there are two different syntaxes for defining hashes with curly braces and they have the potential to confuse newcomers a lot.
You can use the sort method on an array hash or another enumerable object you ll get the default sorting behavior sort based on operator you can use sort with a block and two block arguments to define how one object is different than another block should return 1 0 or 1.
