const firstName = 'William';
const lastName = 'Johnson';
const age = 22;
const str = 'testing';
const tags = 'web devalopement, design';

let val;

// val = firstName + lastName;

// // Concatenation
val = firstName + ' ' + lastName;

// // Append
val = 'Brad ';
val += 'Traversy';

val = 'Hello, my name is ' + firstName + ' and I am ' + age;

// // Escaping
val = 'That\'s awesome, I  can\'t wait';

// // Length
val = firstName.length;

// // concat
val = firstName.concat(' ', lastName);

// // Change case
val = firstName.toUpperCase();
val = firstName.toLowerCase();

val = firstName[0];

// indexOf()
val = firstName.indexOf('l');
val = firstName.lastIndexOf('l');

val = firstName.charAt('5');

val = firstName.charAt(firstName.length -1);

// substring()
val = firstName.substring(0,4);

// slice()
val = firstName.slice(0,4);
val = firstName.slice(-3);

val = tags.split(',');

//replace
val = str.replace('new name', 'testing');

// includes()
val = str.includes('testing');

console.log(val);