completed ch 10 tests and exercises

halrobison · halrobison · commit 6a6cba66aa97 · 2024-01-24T21:33:27.000-06:00
diff --git a/functions/exercise.js b/functions/exercise.js
@@ -0,0 +1,74 @@
+function makeLine(size) {
+    let line = ""
+    for (let i = 0; i < size; i++) {
+        line += "#";
+    }
+    return line;
+}
+
+console.log(makeLine(5));
+
+function makeSquare(size) {
+    return makeRectangle(size, size);  
+}
+
+console.log(makeSquare(5)); 
+
+function makeRectangle(width, height) {
+    let rectangle = "";
+    for (let i = 0; i < height; i++) {
+        rectangle += (makeLine(width)) + '\n'; 
+    }
+    return rectangle.slice(0, -1); 
+}
+
+console.log(makeRectangle(10, 5));
+
+function makeDownwardStairs(height) {
+    let downwardStairs = "";
+    for (let i = 0; i < height; i++) {
+        downwardStairs += (makeLine(i+1) + "\n"); 
+    }
+    return downwardStairs.slice(0, -1);
+}
+
+console.log(makeDownwardStairs(5));
+
+function makeSpaceLine(numSpaces, numChars) {
+    let spaceLine = ""; 
+    for (let i = 0; i < numSpaces; i++) {
+        spaceLine += " ";
+    }
+    for (let i = 0; i < numChars; i++) {
+        spaceLine += "#";
+    }
+    for (let i = 0; i < numSpaces; i++) {
+        spaceLine += " ";
+    }
+    return spaceLine;
+}
+
+console.log(makeSpaceLine(3, 5))
+
+function makeIsoscelesTriangle(height) {
+    let triangle = "";
+    for (let i = 0; i < height; i++) {
+      triangle += (makeSpaceLine(height-i-1, 2*i+1) + '\n');
+    }
+    return triangle.slice(0, -1);
+}
+
+console.log(makeIsoscelesTriangle(4)); 
+
+function reverse(str) {
+    return str.split('').reverse().join('');
+}
+
+function makeDiamond(height) {
+    let diamond = "";
+    diamond += makeIsoscelesTriangle(height); 
+    diamond += "\n" + reverse(diamond); 
+    return diamond;
+}
+
+console.log(makeDiamond(5));
diff --git a/functions/try-it/isPalindrome.js b/functions/try-it/isPalindrome.js
@@ -1,7 +1,12 @@
+let palindrome = "able was i saw elba";
+
 function reverse(str) {
    return str.split('').reverse().join('');
 }
 
 function isPalindrome(str) {
    return reverse(str) === str;
 }
+
+console.log(palindrome);
+console.log(isPalindrome(palindrome));
diff --git a/functions/try-it/printMessage.js b/functions/try-it/printMessage.js
@@ -1,10 +1,11 @@
-let message = "Hello, World!";
+//let message = "Hello, World!"; works
 
 function printMessage() {
    console.log(message);
 }
 
+//let message = "Hello, World!"; works
 printMessage();
+//let message = "Hello, World!"; does not work
 message = "Goodbye";
-printMessage();
-
+printMessage();
diff --git a/functions/try-it/reverse.js b/functions/try-it/reverse.js
@@ -1,5 +1,26 @@
-function reverse(str) {
+//function using accumulator pattern to reverse a string
+let testString = "Excalibur";
+
+function reverseAccumulator(str) {
+   let reversed = '';
+
+   for (let i = 0; i < str.length; i++) {
+       reversed = str[i] + reversed;
+   }
+
+   return reversed;
+}
+
+//function using methods to reverse a string
+function reverseMethod(str) {
    let lettersArray = str.split('');
    let reversedLettersArray = lettersArray.reverse();
    return reversedLettersArray.join('');
 }
+
+//function method reduced to one line with chaining
+function chainedMethod(str) {
+   return str.split('').reverse().join('');
+}
+
+console.log(chainedMethod(testString));
diff --git a/functions/try-it/tests.js b/functions/try-it/tests.js
@@ -0,0 +1,60 @@
+//example of a function that prints arrays
+
+let names = ["Lena", "James", "Julio"];
+
+function printArray(names) {
+    for (let i = 0; i < names.length; i++) {
+        console.log(names[i]);
+    }
+}
+
+printArray(["Lena", "James", "Julio"]);
+console.log("---");
+printArray(["orange", "apple", "pear"]);
+
+//example of calling a function
+function sayHello() {
+    console.log("Hello, World!");
+}
+
+sayHello();
+
+//boolean function 
+function isEven(n) {
+    if (n % 2 === 0) {
+        return true;
+    }
+    return false;
+}
+
+//test
+function plusTwo(num) {
+    return num + 2;
+}
+
+let a = 2;
+
+for (let i=0; i < 4; i++) {
+    a = plusTwo(a);
+}
+
+console.log(a);
+
+//test
+function repeater(str) {
+    let repeated = str + str;
+    console.log(repeated);
+}
+
+repeater('Bob');
+console.log(repeater("Hal"));
+
+//test
+
+let num = 42;
+
+function isEven (num) { 
+    return num % 2 === 0; 
+}
+
+console.log(isEven(43));

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,12 @@`
	`1`	`+let palindrome = "able was i saw elba";`
	`2`	`+`
`1`	`3`	`function reverse(str) {`
`2`	`4`	`return str.split('').reverse().join('');`
`3`	`5`	`}`
`4`	`6`
`5`	`7`	`function isPalindrome(str) {`
`6`	`8`	`return reverse(str) === str;`
`7`	`9`	`}`
	`10`	`+`
	`11`	`+console.log(palindrome);`
	`12`	`+console.log(isPalindrome(palindrome));`