Add RunWithInput function

This function runs the computer with a specified input value that's used
by the first INPUT opcode run by the computer. Any subsequent INPUT
opcodes encounter by the computer while the inputFromConsole option is
false will throw an error.

IntComp/Computer.js

@@ -54,6 +54,17 @@ module.exports = class Computer {
             inputFromConsole: options.inputFromConsole ?? false,
             outputToConsole: options.outputToConsole ?? false,
         };
+
+        /**
+         * An input value provided at runtime
+         *
+         * This value will be passed to the first INPUT opcode made by the computer,
+         * and will then be cleared. If the program being ran tries to make another
+         * call to INPUT, and `options.inputFromConsole` is false, then an error
+         * will be thrown.
+         * @type {number}
+         */
+        this.runtimeInput = null;
     }
 
     /**
@@ -73,6 +84,26 @@ module.exports = class Computer {
         }
     }
 
+    /**
+     * Run the computer with an initial input value
+     *
+     * Runs opcodes on the stack until either the a HALT command is
+     * encountered, or an error is thrown. Stores the input to be used
+     * by the first INPUT opcode encountered.
+     * @param {number} input The input value to initialize the comptuer with.
+     * @returns {void}
+     */
+    async RunWithInput(input) {
+        this.runtimeInput = input;
+        while (this.Execute(this.stack.Get(ComputerParameterMode.IMMEDIATE_MODE)) === true) {
+            if (this.options.tickRate) {
+                // Sleep
+                // eslint-disable-next-line no-await-in-loop, no-promise-executor-return, arrow-parens
+                await new Promise(resolve => setTimeout(resolve, this.options.tickRate));
+            }
+        }
+    }
+
     /**
      * Execute a call using the provided opcode
      *
@@ -208,9 +239,18 @@ module.exports = class Computer {
 
         let userInput;
 
-        do {
-            userInput = Number(prompt("Please enter a number: "));
-        } while (Number.isNaN(userInput));
+        if (this.runtimeInput !== null) {
+            userInput = this.runtimeInput;
+            this.runtimeInput = null;
+        }
+        else if (this.options.inputFromConsole) {
+            do {
+                userInput = Number(prompt("Please enter a number: "));
+            } while (Number.isNaN(userInput));
+        }
+        else {
+            throw new Error("No input found");
+        }
 
         this.stack.Put(outputPosition, userInput);
     }