RUBY - UPDATE HASH

How to update the entries of a Hash?

Let us say, we have a Hash that contains,

5, Is a Number

John, Is a Name

Ruby, Is a Language

As Key and Value pair.

Now, let us say, we want to update the value of the Key, 5 with Is an one digit number.

5, Is an one digit number

Where 5 is the Key and Is an one digit number is the new Value.

We can update the entries of a Hash using two ways:

Let us see in the below example using the first way.

x = {
	5 => "Is a Number", 
	"John" => "Is a Name", 
	"Ruby" => "Is a Language"
}
x[5] = "Is an one digit number"
puts x

{5=>"Is an one digit number", "John"=>"Is a Name", "Ruby"=>"Is a Language"}

So, in the above code we have created a Hash using braces {} and Key and Value pairs.

x = {
	5 => "Is a Number",
	"John" => "Is a Name",
	"Ruby" => "Is a Language"
}

And initialised to the variable x.

Now, we are supposed to update the value of the Key, 5 with Is an one digit number.

So, we have used the below way to update it.

x[5] = "Is an one digit number"

And the entry for the Key 5 is updated in the Hash.

And we get the below output,

{5=>"Is an one digit number", "John"=>"Is a Name", "Ruby"=>"Is a Language"}

Let us see the second way of updating the Key Value using the update() Method.

x = {
	5 => "Is a Number", 
	"John" => "Is a Name", 
	"Ruby" => "Is a Language"
}
x.update({5#{x}Is an one digit number"})
puts x)

{5=>"Is an one digit number", "John"=>"Is a Name", "Ruby"=>"Is a Language"}

So, in the above code we have created a Hash using braces {} and Key and Value pairs.

x = {
	5 => "Is a Number",
	"John" => "Is a Name",
	"Ruby" => "Is a Language"
}

And initialised to the variable x.

Now, we are supposed to update the value of the Key, 5 with Is an one digit number.

So, we have used the below way to update it.

x.update({5#{x}Is an one digit number"})

And the entry for the Key 5 is updated in the Hash.

And we get the below output,

{5=>"Is an one digit number", "John"=>"Is a Name", "Ruby"=>"Is a Language"}