SOLVED CS412 MEAN Problem set 1: functions (three problems)

Part 1 For this assignment, write JavaScript code to satisfy each of the following problems. Each solution should be in a separate le which is named to reect the problem number. For example, PS1/PS1.P1.js would be the le holding your solution to Problem Set 1, Problem 1. For these problems, you’ll need to both write the function (and any helper functions you require), and also a line or two that executes the function with sample input, printing the result on the console. You’ll also need to dig around to nd ways to solve them; for example, when working with strings, take a look at the docs for the String library to get ideas of what can be done. The ‘ocial’ docs are at developer.mozilla.org. Most solutions require chaining a few functions. Note: For each problem, write your solution using ‘fat arrow’ (=>) notation. Example 1 Write a function that returns the largest integer of an array of integers const biggie = items => Math.max(...items); console.log(`Biggest int is: ${biggie([4,8,1,4,3,9,2])}`) Problem 1 (PS1.P1.js) Write a function that takes a string as its input and returns a new string that contains all of the letters in the original string, but in reverse alphabetical order. Ignore punctuation and numbers. Duplicates are ne, so 'exioi' -> 'xoiie'. Test your function using the string ‘supercalifragilisticexpialidocious’. Problem 2 (PS1.P2.js) Write a function that takes as its input the following formatted strings: ‘4+2’ ‘5*7’ ‘6-1’ ‘9/2’ ‘2^8’ (where ^ is exponentiation) This function should Determine the operator (+, *, -, ^, or /) embedded in the string Return a function to implement the input operator that returns the result For example, if the input string is ‘8%3’, return (left, right) => left % right Execute the returned function to evaluate and print each expression. For example, const expression = '8%3'; let operator = evaluate(expression); console.log(`${expression} = ${operator(expression)}`) You can assume that the format of the input string is xed (i.e. a digit, an operator, and a digit, always the same length). Write a helper function to parse the expression that uses destructuring to assign values to left and right. Problem 3 (PS1.P3.js) Write a function that accepts two input parameters: a string, and a decorator function. The function should execute the passed decorator function on the passed string and return the result. Next, write two expressions that call this function. For the rst, pass the string ‘supercalifragilisticexpialidocious’ and a lambda (unnamed) function that returns an array containing fragments of the input string broken on the character ‘c’. For the input string ‘supercalifragilisticexpialidocious’, you should get [‘super’, ‘califragilisti’, ‘cexpialido’, ‘cious’] This is actually a little tougher than it sounds…a hint would be to take a look at how bit/ character stung is done in networking. For the second expression, pass the string ‘supercalifragilisticexpialidocious’ and a lambda function that replaces all of the ‘a’ characters with ‘A’ characters. Return an object that contains the original string, the modied string, the total number of As in the modied string, and the overall length of the modied string: { originalString: xxx, modiedString: xxx, numberReplaced: xxx, length: xxx, } Print the data from the returned object on the console (console.table would be good for this). Submitting your work To submit, upload your solution les (PS1.P1.js, PS1.P2.js, PS1.P3.js) to Gradescope. Note that there are no extensions oered to the deadline.