Working with Strings - Part 1

15.1

Take the ISBN property of the first book from the books array, and log to the console characters at index 6, 4, 9 and 8. Use bracket notation to access individual characters.

console.log(books[0].ISBN['6'], books[0].ISBN['4'], books[0].ISBN['9'], books[0].ISBN[8]);

15.2

Below is the quote variable that stores a string. Find the index of the word 'chess', and log it to the console.

const quote = 'A computer once beat me at chess, but it was no match for me at kick boxing';

console.log(quote.indexOf('chess'));

15.3

Extract the word "boxing" from the same quote string, and log it to the console.

console.log(quote.slice(quote.lastIndexOf(' ') + 1));

15.4

Some authors are noted as "(Contributor)", for example "Julie Sussman (Contributor)". Create a function called isContributor that takes an author's name as an argument, and returns either true (if he's a contributor) of false (if he's not a contributor). The string "(Contributor)" is always the last part of the author's name string.

Code:

isContributor('Julie Sussman (Contributor)');

Expected output:

true

Code:

isContributor('Robert Sedgewick');

Expected output:

false

function isContributor(author) { return author.lastIndexOf('(Contributor)') !== -1; }