Websparks Nodejs Test

questions.md

Q1:

• This calculator takes values that could be written in a browsers route path as a single string. It then returns the result as a number (or an error message).

• Route paths use the '/' symbol so this can't be in our calculator. Instead we are using the '$' symbol as our divide operator.

• You will be passed a string of any length containing numbers and operators:

  • '+' = add
  • '-' = subtract
  • '*' = multiply
  • '$' = divide

• Your task is to break the string down and calculate the expression using this order of operations. (division => multiplication => subtraction => addition)

• If you are given an invalid input (i.e. any character except .0123456789+-*$) you should return the error message:'400: Bad request'

• Remember:

  • Operations are infinite
  • Order of operations is imperative
  • No eval or equivalent functions

• Examples:

  calculate('1+1') => '2'
  calculate('10$2') => '5'
  calculate('1.5\*3') => '4.5'
  calculate('5+5+5+5') => '20'
  calculate('1000$2.5$5+5-5+6$6') =>'81'
  calculate('10-9p') => '400: Bad request'

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Q2:

• Move the first letter of each word to the end of it, then add "ay" to the end of the word. Leave punctuation marks untouched.

• Examples:

pigIt('Pig latin is cool'); // igPay atinlay siay oolcay
pigIt('Hello world !'); // elloHay orldway !

function pigIt(str) {
	let result = '';

	str.split(' ').forEach((word) => {
		if (word.match(/^[a-zA-Z]+$/)) {
			result += word.substring(1, word.length) + word.substring(0, 1) + 'ay ';
		} else {
			result += word + ' ';
		}
	});

	return result.trim();
}