New String Methods

Question 1

What method allows you to see if a string begins with a certain string?

Answer 1

var string = 'RFB2';
string.startsWith('RFB')
> true!

Question 2

Would startWidth allow for case sensitivity?

Answer 2

No

Question 3

What does the second param of startsWith allow you to do?

Answer 3

Starts after X characters
const string = 'RFB2';
string.startsWith('RFB', 3)
> true!

Question 4

What method allows you to see if a string ends with a certain string?

Answer 4

const string = '2-AC-2018-JZ';
string.endsWith('JZ')
> true!

Question 5

How would you selectively use endsWith to ignore the last few characters of a string

Answer 5

Use the second parameter to choose how many characters from the start of the string you want to check:

const string = ‘ADGDRT001’;

string.endsWidth(‘RT’,6);

Question 6

What method would you use to check for the presence of ‘ac’ in a string?

Answer 6

.includes(‘ac’);

Question 7

What method allows you to repeat a string?

Answer 7

.repeat(‘string’);

Question 8

What would .repeat() be useful. Give an example.

Answer 8

to format text in a left pad function.

function leftPad(str, length = 20) {
return `- ${ ' '.repeat(length - str.length) }`;
}