Begun the Functions exercises, forgot to commit previous exercises from personal computer

01_Day_JavaScript_Refresher/01_javascript_refresher/Function Exercises/level1.js

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+function fullName(firstName, lastName) {
+    return `${firstName} ${lastName}`;
+}
+
+function addNumbers(num1, num2) {
+    return num1 + num2;
+}
+
+function _areaOfCircle(radius) {
+    return Math.PI * radius * radius;
+}
+
+function convertCelciusToFahrenheit(celsius) {
+    return (celsius * 1.8) + 32;
+}
+
+function bmi(bmi, height = 1) {
+    // if bmi only is submitted, bmi will be used as the bmi
+    let bmi = weigth / (height * height);
+    
+    if (bmi < 18.5) {
+        console.log("Underweight");
+    } else if (bmi < 24.9) {
+        console.log("Normal weight");
+    } else if (bmi < 29.9) {
+        console.log("Overweight");
+    } else {
+        console.log("Obese");
+    }
+
+    return bmi;
+}
+
+function checkSeason(month) {
+    seasons = {
+        winter: ["december", "january", "february"],
+        spring: ["march", "april", "may"],
+        summer: ["june", "july", "august"],
+        autumn: ["september", "october", "november"]
+    };
+    month = month.toLowerCase();
+    
+    for (const season in seasons) {
+        if (Object.hasOwnProperty.call(seasons, season)) {
+            const months = seasons[season];
+            months.forEach(m => {
+                if (m == month) {
+                    return season;
+                }
+            });
+        }
+    }
+    console.log("There is no such month");
+    return "noSeason";
+}

01_Day_JavaScript_Refresher/01_javascript_refresher/Function Exercises/level2.js

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+function solveQuadEquation(a, b, c) {
+    const inSquare = (b * b) - (4 * a * c);
+    if (inSquare < 0) {
+        console.log("No real solutions");
+        return;
+    }
+    const lower = (-b - inSquare) / (2 * a);
+    const higher = (-b + inSquare) / (2 * a);
+    return {lower, higher};
+}
+
+function printArray(arr) {
+    arr.forEach(elem => {
+        console.log(elem);
+    });
+}
+
+function showDateTime() {
+    const format = {
+        year: "numeric",
+        month: "2-digit",
+        day: "2-digit",
+        hour: "2-digit",
+        minute: "2-digit"
+    };
+    console.log(Intl.DateTimeFormat(undefined, format).format(new Date()).replace(',', ''));
+}
+
+function swapValues(x, y) {
+    return [y, x]; // ???
+}
+
+function reverseArray(arr) {
+    const newArray = Array(arr.length);
+    arr.forEach((elem, index, arrayCopy) => {
+        newArray[arrayCopy.length - index - 1] = elem;
+    });
+    return newArray;
+}
+
+function capitalizeArray(arr) {
+    arr.forEach((elem, index) => {
+        arr[index] = elem.toUpperCase();
+    })
+    return arr;
+}
+
+function addItem(item, arr) {
+    arr.push(item);
+    return arr;
+}
+
+function removeItem(index, arr) {
+    arr.splice(index,1);
+    return arr;
+}
+
+function evensAndOdds(val) {
+    let [evens, odds] = [Math.floor(val/2), Math.round(val/2)];
+    console.log(`There are ${odds} odds`);
+    console.log(`There are ${evens} evens`);
+} // this will not count 0 as an even number as not positive
+
+function sum() {
+    let sum = 0;
+    for (let i = 0; i < arguments.length; i++) {
+        sum += arguments[i];
+    }
+    return sum;
+}
+
+function userIdGenerator() {
+    const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+    result = "";
+    for (let i = 0; i < 7; i++) {
+        result += chars[Math.floor(Math.random() * chars.length)];
+    }
+    console.log(result);
+    return result;
+}