David Bobb: aca-node

index.js

@@ -1 +1,90 @@
+const readline = require('readline');
 
+const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout
+})
+
+let recursivePrompt = () => {
+    rl.question('Input:', (answer) => {
+        boolOrCalc(answer);
+    });
+}
+
+let symbolArray = ['+', '-', '/', '*', '>', '<', '===', '!=='];
+
+// check if bool or cal first
+let boolOrCalc = (answer) => {
+    let operator;
+    for (let i = 0; i < symbolArray.length; i++) {
+        let position = answer.indexOf(`${symbolArray[i]}`);
+        if (position !== -1) {
+            operator = symbolArray[i];
+            // process bool or calc if true
+            return createEquation(answer, operator, position);
+        }
+    }
+    // check if var declaration if false
+    return varChecker(answer);
+}
+
+// check if input is var declaration
+let varChecker = (answer) => {
+    if (answer.startsWith('let') || answer.startsWith('const')) {
+        // set var declaration builder  if true
+        createVariable(answer);
+        return recursivePrompt();
+    } else if (typeof answer !== 'undefined') {
+        if(typeof global[`${answer}`] === 'undefined') {
+            console.log('Syntax Error');
+            return recursivePrompt();
+        } else {
+            console.log(global[`${answer}`]);
+            return recursivePrompt();
+        }
+    }
+}
+// next two functions process input if var, calc, or boolean
+
+// var declaration builder
+let createVariable = (input) => {
+    let inputArray = input.split(' ');
+    let keyWord = inputArray[1];
+    let variable = inputArray[3];
+    global[keyWord] = variable;
+}
+
+// process bool or calc equation
+let createEquation = (equation, operator, position) => {
+    let num1 = equation.slice(0, position).trim();
+    let num2 = equation.slice(position + 1).trim();
+    let oper = operator;
+    switch(oper) {
+        case '+' :
+            console.log(parseFloat(num1) + parseFloat(num2));
+        break
+        case '-' :
+            console.log(parseFloat(num1) - parseFloat(num2));
+        break
+        case '/' :
+            console.log(parseFloat(num1) / parseFloat(num2));
+        break
+        case '*' :
+            console.log(parseFloat(num1) * parseFloat(num2));
+        break
+        case '<' :
+            console.log(parseFloat(num1) < parseFloat(num2));
+        break
+        case '>' :
+            console.log(parseFloat(num1) > parseFloat(num2));
+        break
+        case '===' :
+            console.log(parseFloat(num1) === parseFloat(num2)); 
+        break
+        case '!==' :
+            console.log(parseFloat(num1) !== parseFloat(num2));     
+    }
+    return recursivePrompt()
+}
+
+recursivePrompt()