Init commit with many years of arduino sketches and projects. I dont know if the esp8266 includes much, but there are also libraries. I hope they dont have crazy automatic versioning through the Arduino IDE.

Projects/7 Segment Main/_7_Segment_Letters/_7_Segment_Letters.ino

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+int ledDigitalOne[] = {1, 2, 3, 4, 5, 6, 7}; //the three digital pins of the digital LED 
+                                   //9 = redPin, 10 = greenPin, 11 = bluePin
+
+const boolean ON = HIGH;     //Define on as LOW (this is because we use a common 
+                            //Anode RGB LED (common pin is connected to +5 volts)
+const boolean OFF = LOW;   //Define off as HIGH
+
+//Predefined Colors
+
+const boolean One[] = {OFF, ON, OFF, OFF, OFF, OFF, ON};
+const boolean Two[] = {ON, OFF, ON, ON, OFF, ON, ON}; 
+const boolean Three[] = {ON, ON, OFF, ON, OFF, ON, ON}; 
+const boolean Four[] = {OFF, ON, OFF, ON, ON, OFF, ON}; 
+const boolean Five[] = {ON, ON, OFF, ON, ON, ON, OFF}; 
+const boolean Six[] = {ON, ON, ON, ON, ON, ON, OFF}; 
+const boolean Seven[] = {OFF, ON, OFF, OFF, OFF, ON, ON}; 
+const boolean Eight[] = {ON, ON, ON, ON, ON, ON, ON};
+const boolean Nine[] = {ON, ON, OFF, ON, ON, ON, ON};
+const boolean Zero[] = {ON, ON, ON, OFF, ON, ON, ON};
+
+//An Array that stores the predefined colors (allows us to later randomly display a color)
+const boolean* NUMBERS[] = {One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Zero};
+
+void setup(){
+  for(int i = 0; i < 9; i++){
+   pinMode(ledDigitalOne[i], OUTPUT);   //Set the three LED pins as outputs
+  }
+}
+
+void loop(){
+
+/* Example - 1 Set a color
+   Set the three LEDs to any predefined color
+*/
+
+
+   setNumber(ledDigitalOne, Eight);   //Set the color of LED one
+   
+   for (int i = 0; i < 10; i++)
+   {
+     setNumber(ledDigitalOne, Nine);
+     delay (1000);
+     setNumber(ledDigitalOne, Eight);
+     delay (1000);
+     setNumber(ledDigitalOne, Seven);
+     delay (1000);
+     setNumber(ledDigitalOne, Six);
+     delay (1000);
+     setNumber(ledDigitalOne, Five);
+     delay (1000);
+     setNumber(ledDigitalOne, Four);
+     delay (1000);
+     setNumber(ledDigitalOne, Three);
+     delay (1000);
+     setNumber(ledDigitalOne, Two);
+     delay (1000);
+     setNumber(ledDigitalOne, One);
+     delay (1000);
+     setNumber(ledDigitalOne, Zero);
+     delay (1000);
+   }
+
+/* Example - 2 Go through Random Colors
+  Set the LEDs to a random color
+*/
+   //randomNumber();
+
+}
+
+//void randomNumber(){
+  //int rand = random(0, sizeof(NUMBER / 2);  //get a random number within the range of colors
+  //setNumber(ledDigitalOne, NUMBER[rand]);  //Set the color of led one to a random color
+  //delay(1000);
+//}
+
+/* Sets an led to any color
+   led - a three element array defining the three color pins (led[0] = redPin, led[1] = greenPin, led[2] = bluePin)
+   color - a three element boolean array (color[0] = red value (LOW = on, HIGH = off), color[1] = green value, color[2] =blue value)
+*/
+
+void setNumber(int* led, boolean* number)
+{
+ for(int i = 0; i < 7; i++)
+ {
+   digitalWrite(led[i], number[i]);
+ }
+}
+
+/* A version of setColor that allows for using const boolean colors
+*/
+
+void setNumber(int* led, const boolean* number)
+{
+  boolean tempNumber[] = {number[0], number[1], number[2], number[3], number[4], number[5], number[6]};
+  setNumber(led, tempNumber);
+}
+// the loop routine runs over and over again forever:
+