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Peepoyeet Automated updating of API pages at this location, to reflect patch changes, has ceased from 10.1.7 onwards.

Returns the current spell haste percentage for a unit. 

spellHastePercent = UnitSpellHaste(unit)

Arguments

unit
string : UnitId

Returns

spellHastePercent
number - The spell haste percent for the queried unit. Will return 0 if no valid unitId is provided.

Example

Prints the current spell haste percentage modifier for the targeted unit: 

/dump UnitSpellHaste("target")
> 13.515724182129

You can use this function to get the non-modified cast time of a spell: 

local spellId = 2060 --Greater Heal
local castTimeWithHaste = select(7,GetSpellInfo(spellId))
local spellHasteModifier = 1-UnitSpellHaste("player")/100
local castTimeWithoutHaste = floor(castTimeWithHaste/spellHasteModifier/100)/10
print(castTimeWithoutHaste)

This should print 2.5 for Greater Heal.

Patch changes

Cataclysm Patch 4.0.6 (2011-02-08): Added.