Newbie question on led number

Using Arduino LEDs and Multiplexing
1

I have downloaded a led project from youtube on How to control WS2812B RGB LEDs with FastLED and Arduino.

In part of the coding, there is:

leds[31] = CRGB::HotPink;
leds[32] = CRGB::BlueViolet;
leds[33] = CRGB::HotPink;
and so on upto:
leds[45] = CRGB::HotPink;

What do the numbers in the brackets mean. Are they the led number in a strip or something else.

Thanks

2

Yes. That is the LED number. The LED on the strip closest to the connection to the Arduino is the 0th element, and so on. This is the index of the leds array.