Vim stridx vs match

stridx_vs_match.vim

function RandStr(len)
py3 << EOF
import vim, random
rstr = ''.join([chr(random.randint(65,123)) for i in range(int(vim.eval('a:len')))])
vim.command(f"return '{rstr}'")
EOF
endfunction


function TimeStridx(numiter, candidates)
	let l:tottime = 0.0
	for l:in in range(a:numiter)
		let l:cands = copy(a:candidates)
		let l:search = RandStr(10)
		let l:start = reltime()
		call filter(l:cands, 'stridx(v:val, l:search) == 0')
		let l:tottime += reltimefloat(reltime(l:start))
	endfor
	return l:tottime / a:numiter
endfunction


function TimeMatch(numiter, candidates)
	let l:tottime = 0.0
	for l:in in range(a:numiter)
		let l:cands = copy(a:candidates)
		let l:search = RandStr(10)
		let l:start = reltime()
    call filter(l:cands, {_,x -> match(x, l:search) == 0})
		let l:tottime += reltimefloat(reltime(l:start))
	endfor
	return l:tottime / a:numiter
endfunction

function TimeCompare(numiter)
	let l:candidates = []
	for i in range(100000)
		call add(l:candidates, RandStr(100))
	endfor
	let l:time_stridx = TimeStridx(a:numiter, l:candidates)
	let l:time_match  = TimeMatch(a:numiter, l:candidates)
	echom printf('stridx: %.4fs, match: %.4fs', l:time_stridx, l:time_match) 
	echom printf('Difference: %.4fs', abs(l:time_match - l:time_stridx))
endfunction