string_methods.js

// Declare a variable named challenge and assign it to an initial value '30 Days Of JavaScript'.
let challenge = '30 Days Of JavaScript';
console.log(challenge);

// Print the length of the string on the browser console using console.log()
console.log(challenge.length);

// Change all the string characters to capital letters using toUpperCase() method
console.log(challenge.toUpperCase());

// Change all the string characters to lowercase letters using toLowerCase() method
console.log(challenge.toLowerCase());

// Cut (slice) out the first word of the string using substr() or substring() method
console.log(challenge.substring(0,2));

// Slice out the phrase Days Of JavaScript from 30 Days Of JavaScript.
console.log(challenge.substring(3,21));

// Check if the string contains a word Script using includes() method
console.log(challenge.includes('Script'));

// Split the string into an array using split() method
console.log(challenge.split());

// Split the string 30 Days Of JavaScript at the space using split() method
console.log(challenge.split(' '));

// 'Facebook, Google, Microsoft, Apple, IBM, Oracle, Amazon' split the string at the comma and change it to an array.
let string = 'Facebook, Google, Microsoft, Apple, IBM, Oracle, Amazon';
console.log(string.split(', '));

// Change 30 Days Of JavaScript to 30 Days Of Python using replace() method.
console.log(challenge.replace('JavaScript', 'Python'));

// What is character at index 15 in '30 Days Of JavaScript' string? Use charAt() method.
console.log(challenge.charAt(15));

// What is the character code of J in '30 Days Of JavaScript' string using charCodeAt()
console.log(challenge.charCodeAt('J'));

// Use indexOf to determine the position of the first occurrence of a in 30 Days Of JavaScript
console.log(challenge.indexOf('a'));

// Use lastIndexOf to determine the position of the last occurrence of a in 30 Days Of JavaScript.
console.log(challenge.lastIndexOf('a'));

/* Use indexOf to find the position of the first occurrence of the word because in the following sentence:
   'You cannot end a sentence with because because because is a conjunction' */
let sentenceBecause = 'You cannot end a sentence with because because because is a conjunction'
console.log(sentenceBecause.indexOf('because'));

/* Use lastIndexOf to find the position of the last occurrence of the word because in the following sentence:
   'You cannot end a sentence with because because because is a conjunction' */
console.log(sentenceBecause.lastIndexOf('because'));

/* Use search to find the position of the first occurrence of the word because in the following sentence:
   'You cannot end a sentence with because because because is a conjunction' */
console.log(sentenceBecause.search('because'));

// Use trim() to remove any trailing whitespace at the beginning and the end of a string.E.g ' 30 Days Of JavaScript '.
let training = ' 30 Days Of JavaScript ';
console.log(training.trim());

// Use startsWith() method with the string 30 Days Of JavaScript and make the result true
console.log(challenge.startsWith('30'));

// Use endsWith() method with the string 30 Days Of JavaScript and make the result true
console.log(challenge.endsWith('t'));

// Use match() method to find all the a’s in 30 Days Of JavaScript
console.log(challenge.match('a'));

// Use concat() and merge '30 Days of' and 'JavaScript' to a single string, '30 Days Of JavaScript'
let days = '30';
console.log(days.concat('Days', 'of', 'JavaScript'));

// Use repeat() method to print 30 Days Of JavaScript 2 times
console.log(challenge.repeat(2));