Add DecimalPlaceIsNonZero function

This function will be needed later for the computer when checking
opcodes.

IntComp/Computer.js

@@ -42,16 +42,16 @@ module.exports = class Computer {
         let status = true;
         switch (opcode) {
             case this.OPCODES.ADD: {
-                const operandLeft = this.stack.Next().GetUsingStackValue();
-                const operandRight = this.stack.Next().GetUsingStackValue();
+                const operandLeft = this.stack.Next().Get();
+                const operandRight = this.stack.Next().Get();
                 const position = this.stack.Next().Get();
 
                 this.Operation_Add(operandLeft, operandRight, position);
                 break;
             }
             case this.OPCODES.MULTIPLY: {
-                const operandLeft = this.stack.Next().GetUsingStackValue();
-                const operandRight = this.stack.Next().GetUsingStackValue();
+                const operandLeft = this.stack.Next().Get();
+                const operandRight = this.stack.Next().Get();
                 const position = this.stack.Next().Get();
 
                 this.Operation_Multiply(operandLeft, operandRight, position);
@@ -122,3 +122,23 @@ module.exports = class Computer {
         console.log(this.stack.Dump());
     }
 };
+
+/**
+ * Check whether the value at a specific spot in a number is non-zero
+ *
+ * Similar to the bitwise & operator, checks a "place" in a decimal number
+ * to see if it has a non-zero value.
+ *
+ * @example
+ * const test = 107;
+ * console.log(DecimalPlaceIsNonZero(test, 1)) // true
+ * console.log(DecimalPlaceIsNonZero(test, 2)) // false
+ * console.log(DecimalPlaceIsNonZero(test, 3)) // true
+ *
+ * @param {number} input The number to check
+ * @param {number} place The power of 10 to check against
+ * @returns {boolean} Whether the value in that number's place is non-zero
+ */
+function DecimalPlaceIsNonZero(input, place) {
+    return !!Math.floor((input % 10**place) / 10**(place - 1));
+}