JS
challenger

Find the position of one string in another

Write a function that takes a string as argument. The string contains the substring 'is'. Return the index of 'is'.
function
myFunction
(
a
)
{

return
}
Test Cases:
myFunction("praise")
Expected
3
myFunction("risky")
Expected
1
myFunction("paris")
Expected
3

How to solve it

To get the index of a substring in another string, we can use the indexOf method.
'wxyz'.indexOf('xy');
// output: 1
'together'.indexOf('ther');
// output: 4
Remember that strings in JavaScript are zero-indexed (see here). That means that we have to start counting with 0. So, the index of is in paris is 3, although is starts at the fourth character.