Added new algoritm

Author: josecarlosweb

Linear-Algebra/test/test.js

@@ -11,7 +11,7 @@ var assert = require('assert')
 var fs = require('fs')
 
 // file is included here
-eval(fs.readFileSync('src/la_lib.js') + '')
+eval(fs.readFileSync('../src/la_lib.js') + '')
 // Tests goes here
 
 // creating some vectors

String/CheckWordOccurrence.js

@@ -0,0 +1,25 @@
+/**
+ * Check and count occurrence of each word in a string
+ * Inputs a String eg. Madonna and Boolean
+ */
+
+const checkWordOccurrence = (str, isCaseSensitive = false) => {
+    if (typeof str != 'string') {
+        throw new TypeError('The first param should be a string');
+    }
+    if (typeof isCaseSensitive != 'boolean') {
+        throw new TypeError('The second param should be a boolean')
+    }
+
+    let result = {}
+    if (str.length > 0) {
+        for (let i = 0; i < str.length; i++) {
+            const word = isCaseSensitive ? str[i] : str[i].toUpperCase()
+            if(/\s/.test(word)) continue;
+            result[word] = (!result[word]) ? 1 : result[word] + 1
+        }
+
+    }
+    return result;
+}
+export { checkWordOccurrence }

String/CheckWordOcurrence.test.js

@@ -0,0 +1,34 @@
+import {checkWordOccurrence} from './CheckWordOccurrence';
+describe('checkWordOccurrence', () => {
+    it('expects throw on insert wrong string', () => {
+        const value = 123;
+        expect(() => checkWordOccurrence(value)).toThrow();
+    });
+    it('expect throw on insert wrong param for case sensitive', () => {
+        const value = 'hello';
+        expect(() => checkWordOccurrence(value, value)).toThrow();
+    });
+    it('check occurrence with case sensitive', () => {
+        const stringToTest = "A Mad World";
+        const charsOccurrences = checkWordOccurrence(stringToTest, true);
+        const expectResult = {A: 1, M: 1, a: 1, d: 2, W: 1, l: 1, o: 1, r: 1};
+        const occurrencesObjectKeys = Object.keys(charsOccurrences);
+        const expectObjectKeys = Object.keys(expectResult);
+        expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length);
+        expectObjectKeys.forEach(key => {
+            expect(expectResult[key]).toBe(charsOccurrences[key]);
+        });
+    });
+    it('check occurrence with case insensitive', () => {
+        const stringToTest = "A Mad World";
+        const charsOccurrences = checkWordOccurrence(stringToTest, false);
+        const expectResult = {A: 2, D: 2, L: 1, M: 1, O: 1, R: 1, W: 1};
+        const occurrencesObjectKeys = Object.keys(charsOccurrences);
+        const expectObjectKeys = Object.keys(expectResult);
+        expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length);
+        expectObjectKeys.forEach(key => {
+            expect(expectResult[key]).toBe(charsOccurrences[key]);
+        });
+
+    });
+});

package.json

@@ -16,7 +16,9 @@
     "node-fetch": "2.6.1"
   },
   "standard": {
-    "env": [ "jest" ]
+    "env": [
+      "jest"
+    ]
   },
   "devDependencies": {
     "babel-jest": "^26.3.0",