WoW API: GetNumSkillLines

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Reference 

WoW API < GetNumSkillLines

Returns the number of skill lines in the skill list. This includes headers.

GetNumSkillLines();

Arguments
none

Returns
numSkills(Number)
The line count for the skills window, including headers.

Example
local numSkills = GetNumSkillLines();
for i=1, numSkills do
  local skillName = GetSkillLineInfo(i);
end
Result
"Armor"

Example from SkillFrame.lua
local numSkills = GetNumSkillLines();

Description
Returns the number of lines in the skill window, including headers. This number can be used to loop through all skill lines and retrieving the info using GetSkillLineInfo