Interpolation in Ruby

Interpolation is about using expressions and values inside a string. For example, consider a variable named a which contains 4 and variable b containing 6. Now, we have to print 4 * 6 = 24

a * b = a*b. Will this work?

Nope. It returned an unexpected result. We need the values of a, b and a*b to be printed. Now, Interpolation comes into picture. Using Interpolation, we can include expression and values inside strings.

To Interpolate the value of a, do the following: puts " #{a} "

It returned the value of a instead of "a" as a string. Likewise, we have to do the same for the variable b and the expression a*b.

Ruby evaluates the value of the variable or an expression given between the curly braces.

#{a*b}

Ruby, evaluates the value of a*b and interpolates into string.

Interpolating Strings:

Consider a variable with a value.

person = "Sachin Tendulkar";

Now, we have to display "I love Sachin Tendulkar".

We've expected "I love Sachin Tendulkar" but it displayed "I love person". Now, let's interpolate the variable person.