JS1k: The JavaScript code golfing competition

eval(s=(f=(i,o,p,c)=>(c=i.charCodeAt(p))?f(i,o+(c<256?i[p]:o.slice(c&2047,(c&2047)+(c>>11))),++p):o)(`/***᠁、态쀁ꀁ\n *   ᡈえ恈쁈遈1K LZ77 source compression npm module袅See http://js1k-䃱.solsort.ᣱ for details炀㠁/\n\nvar䣰 = input => {\n⁈⌄out⬕ ''\n⬝᧓(⌄iᬐ0;ᬾ<㌒.length;)㬛䌞bes⌫0譚L⭑⭫䭚䌷j㍀j⍇; ++j⍗䭚挳k㍀k +㎢ &&㌒[⏍i] ==㬑⯟j]⎨k捗⁈}现if(k >孻菼⁈歼k갯ᬐj篿鰄歼Math.min(卼, 30)厊ᰛ孼< 3菼㬦+䏩i]殱++i呵 else쳊String.fromCharCodeⲞᯎ2048ᡆ尢琎ⓟ卼屵專䬦㌦㭚.replace(/\\\\/g, '\\\\\\\\'䕏嶘n㶤nꖭr㶤rꖭ0㶤0鶭[\$]㶤\$鶭\`㶤\`ᶭ⬝return '(f=(i,o,p,c)=>(c=i.c㴯At(p))?f♑+(c<256?i[p]:o.sliᶞc&ᴾ7,㺉)ṵ>>11))),++p):o)(\`'ᯎ涋ᳶ '\`,\`\`,0)'\nᰌᰛtypeof䄀⏧'object'䍗㄁.exp᧋⌏䃱\n洄document.write('<ᣴ>⚭\`\n>㣩㭏\n\n\${s㭏ᰌ>䣰(リ)弾坖䝥꽑罭⽑eval(蝖⾗羬)ᾦ⁈\`喘<ⶤ&lt;'῀}\n`,``,0))

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

/********************************************************************
 *                                                                  *
 *                                                                  *
 *              1K LZ77 source compression npm module               *
 *                                                                  *
 *                                                                  *
 *        See http://js1k-compress.solsort.com for details          *
 *                                                                  *
 *                                                                  *
 *                                                                  *
 ********************************************************************/

var compress = input => {
    var output = ''

    for(var i = 0; i < input.length;) {
        var best = 0
        var bestLength = 0

        for(var j = 0; j < i; ++j) {

            for(var k = 0; k + j < i && input[k + i] === input[k + j]; ++k) {
            }

            if(k > bestLength) {
                bestLength = k
                best = j
            }
        }

        bestLength = Math.min(bestLength, 30)

        if(bestLength < 3) {
            output += input[i]
            ++i
        } else {
            output += String.fromCharCode(best + 2048 * bestLength)
            i += bestLength
        }
    }

    output = output
      .replace(/\\/g, '\\\\')
      .replace(/\n/g, '\\n')
      .replace(/\r/g, '\\r')
      .replace(/\0/g, '\\0')
      .replace(/[$]/g, '\\$')
      .replace(/`/g, '\\`')

    return '(f=(i,o,p,c)=>(c=i.charCodeAt(p))?f(i,o+(c<256?i[p]:o.slice(c&2047,(c&2047)+(c>>11))),++p):o)(`' + output
        + '`,``,0)'
}

if(typeof module === 'object') {
    module.exports = compress
} else {
    document.write('<pre>' + `
> source.length

${s.length}

> compress(source).length

${compress(s).length}

> compress(source)

${compress(s)}

> eval(compress(source))

${eval(compress(s))}
    `.replace(/</g, '&lt;'))
}