Junior Developer Central JS Practice Exercise - 07

 

Question: 

Write a Javascript program to extract the first half of a string of even length. 

Answer: 

function extHalf (str) {

let str001 = str; 

if (str001.length % 2 === 0) { 

return str001.slice(0, str001.length/2); 

} else {

return str001

}

}

> we declare a function 'extHalf'

> it has one parameter 'str'

> we create a variable 'str001'

> we initialize it with a value of our argument 'str' 

> we then open if/else statements to check if the length of 'str001' is even

> we use the modulo / remainder operator to check if the length is even

> if it is even then the modulo operator would have '0' as remainder

> if it is odd then the modulo operator would have '1' as remainder

> if 'str001' is even then we want to return the first half 

> we do that by using the slice method on 'str001' 

> our start parameter is 0 as we want to slice the first half

> we use str001.length / 2, which will give us the half of the total length of the string

> so our end parameter is the half of the total length of the string

> if 'str001' is an odd number then we want to return the same string without any extraction