short string lookup

Benchmark created on November 7, 2025

Setup

function assertEqual(a, b) {
	if (a !== b) throw new Error(`${a} !== ${b}`);
}

const candidates = ['ad', 'uk', 'za'];
const stringString = 'ad,ae,af,ag,ai,al,am,ao,ar,as,at,au,aw,az,ba,bb,bd,be,bf,bg,bh,bi,bj,bn,bo,br,bs,bt,bw,by,bz,ca,cd,cf,cg,ch,ci,ck,cl,cm,cn,co,cr,cu,cv,cy,cz,de,dj,dk,dm,do,dz,ec,ee,eg,es,et,fi,fj,fm,fo,fr,ga,gb,gd,ge,gf,gg,gh,gi,gl,gm,gn,gp,gq,gr,gt,gu,gy,hk,hn,hr,ht,hu,id,ie,il,im,in,iq,is,it,je,jm,jo,jp,ke,kg,kh,ki,kn,kr,kw,ky,kz,la,lb,lc,li,lk,ls,lt,lu,lv,ly,ma,mc,md,me,mg,mk,ml,mm,mn,mq,mr,ms,mt,mu,mv,mw,mx,my,mz,na,nc,ne,ng,ni,nl,no,np,nr,nu,nz,om,pa,pe,pf,pg,ph,pk,pl,pn,pr,ps,pt,py,qa,re,ro,rs,ru,rw,sa,sb,sc,se,sg,sh,si,sk,sl,sm,sn,so,sr,st,sv,td,tg,th,tj,tk,tl,tm,tn,to,tr,tt,tw,tz,ua,ug,us,uy,uz,vc,ve,vg,vi,vn,vu,ws,ye,yt,za,zm,zw,';
const stringArray = ["ad","ae","af","ag","ai","al","am","ao","ar","as","at","au","aw","az","ba","bb","bd","be","bf","bg","bh","bi","bj","bn","bo","br","bs","bt","bw","by","bz","ca","cd","cf","cg","ch","ci","ck","cl","cm","cn","co","cr","cu","cv","cy","cz","de","dj","dk","dm","do","dz","ec","ee","eg","es","et","fi","fj","fm","fo","fr","ga","gb","gd","ge","gf","gg","gh","gi","gl","gm","gn","gp","gq","gr","gt","gu","gy","hk","hn","hr","ht","hu","id","ie","il","im","in","iq","is","it","je","jm","jo","jp","ke","kg","kh","ki","kn","kr","kw","ky","kz","la","lb","lc","li","lk","ls","lt","lu","lv","ly","ma","mc","md","me","mg","mk","ml","mm","mn","mq","mr","ms","mt","mu","mv","mw","mx","my","mz","na","nc","ne","ng","ni","nl","no","np","nr","nu","nz","om","pa","pe","pf","pg","ph","pk","pl","pn","pr","ps","pt","py","qa","re","ro","rs","ru","rw","sa","sb","sc","se","sg","sh","si","sk","sl","sm","sn","so","sr","st","sv","td","tg","th","tj","tk","tl","tm","tn","to","tr","tt","tw","tz","ua","ug","us","uy","uz","vc","ve","vg","vi","vn","vu","ws","ye","yt","za","zm","zw"];
const stringSet = new Set(stringArray);

Test runner

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringString.includes(`${c},`);
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringString.indexOf(`${c},`) !== -1;
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringArray.includes(c);
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringArray.indexOf(c) !== -1;
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringSet.has(c);
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringString.includes(c);
  assertEqual(contains, !(i & 1));
}

for (let i = 0; i < 3; ++i) {
  const c = candidates[i];
  const contains = stringString.indexOf(c) !== -1;
  assertEqual(contains, !(i & 1));
}

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on November 7, 2025