Sprint 1 interpret: notes for 1-percentage-change

Author: Richiealx

Sprint-1/3-mandatory-interpret/answers.md

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+# Sprint 1 — Mandatory Interpret (Notes)
+
+## 1-percentage-change.js
+- What the program does:
+- Inputs:
+- Output:
+- Unfamiliar syntax (with link):
+- What I changed / why:
+
+
+## 2-time-format.js
+- What the program does:
+- Inputs:
+- Output:
+- Unfamiliar syntax (with link):
+- What I changed / why:
+
+## 3-to-pounds.js
+- What the program does:
+- Inputs:
+- Output:
+- Unfamiliar syntax (with link):
+- What I changed / why:
+
+
+## 1-percentage-change.js
+
+### a) How many function calls are there?
+There are 5 function calls:
+- Number(carPrice.replaceAll(",", ""))
+- carPrice.replaceAll(",", "")
+- Number(priceAfterOneYear.replaceAll(",", ""))
+- priceAfterOneYear.replaceAll(",", "")
+- console.log(...)
+
+---
+
+### b) Where did the error occur and why?
+The error occurred on the line:
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
+The replaceAll function was missing a comma between its arguments. The correct syntax requires two arguments: replaceAll(search, replacement).
+
+Fix:
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+
+---
+
+### c) Variable reassignment statements
+- carPrice = Number(carPrice.replaceAll(",", ""))
+- priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""))
+
+---
+
+### d) Variable declarations
+- let carPrice = "10,000"
+- let priceAfterOneYear = "8,543"
+- const priceDifference = carPrice - priceAfterOneYear
+- const percentageChange = (priceDifference / carPrice) * 100
+
+---
+
+### e) What does Number(carPrice.replaceAll(",", "")) do?
+First, replaceAll(",", "") removes commas from the string "10,000", producing "10000".
+Then, Number(...) converts the string "10000" into the numeric value 10000.
+This ensures arithmetic operations can be performed correctly.