Use the function blackbox(x, y, z) with integers and try to find out what this does :D You can just copy the code into a Node.js terminal/REPL or into a browser (Right-click -> inspect element; then select the tab console)

blackbox.js

// Paste this into a JS console & try to figure out what this does :D
// Use blackbox([x: integer], [y: integer], [z: integer])
var _0x3b29=['mCorW4tcPCobW73dMgi5WPOCW6Gx','WPLHsSkShmohW4a1dLldVqG','W5BcVgVdGGLXp8kvaZ5RW6C','zhvS','WRldJCo4t8ksW7rxF8oRsSkE','W6ThnSoDgXHyWOfYW5pcPG09','eSkwCMmRoGK','BuFcHuv1BLjuyZiT','WPFdSCkCWOFcUG','fCkqlu4Z','eSkdmeSDW7FdQhBcHSkbeZm','FJLysmk5WPKvW6um','vN3dP8oCWODgemkEAq','WR/dGCo8sCkxWRLLvmopBCkkW5i','WOP7WQZcTHS8WQLjWRrZW4K','W6TfBSkCAuaGWPS','W5NcOmkHxCkZW4mqW6m','WPanE8oVWQldImk2','W6GWWQnuDG','smk9WPbJjCoNWRxcQJX8WQGi','nSouW4Ksjuj9','pf7dM8odsa','mmkwdfCG','W4VdVd1dWOpcHXLbWPrZvhe','fmoRWQhdVv7dRmoRWPhdMgZdMmoTpq','W5maWRZcHCk6WR40W4yyCSkY','lN/dT8oxEG','WOxcHGWguZFcVW','WQbzW5ZdVSon','W4LhrCo0hCo3WQjKW4BdUZZcS8kY'];var _0x1472=function(_0xcb64ae,_0x1aa288){_0xcb64ae=_0xcb64ae-(-0x7c3*-0x4+-0x1d30+-0x74);var _0x23b703=_0x3b29[_0xcb64ae];if(_0x1472['itqDtv']===undefined){var _0x4068d1=function(_0x31a0b3){var _0x5127eb='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=';var _0x558ef3='';for(var _0x203cf2=-0x1*-0x209+0x1a86*-0x1+0x1*0x187d,_0x42ed63,_0x51dc4e,_0x2d3ee8=-0x1338+0x20e0+-0xda8;_0x51dc4e=_0x31a0b3['charAt'](_0x2d3ee8++);~_0x51dc4e&&(_0x42ed63=_0x203cf2%(0x116*0x1+-0x4*0x53+-0x1d*-0x2)?_0x42ed63*(0x6b2+-0x971+0x2ff)+_0x51dc4e:_0x51dc4e,_0x203cf2++%(-0x101e+-0x4b3+0x14d5*0x1))?_0x558ef3+=String['fromCharCode'](-0x8bf*0x3+0x42*0x40+0x4*0x2af&_0x42ed63>>(-(-0x448+-0x1565+0x19af)*_0x203cf2&-0x213f+0x168d*-0x1+0x37d2)):-0x5*-0x609+-0x1*-0x1ba3+-0x39d0){_0x51dc4e=_0x5127eb['indexOf'](_0x51dc4e);}return _0x558ef3;};var _0x11afcc=function(_0x32ffa7,_0x4d6950){var _0x4b91d=[],_0x3da109=-0x2*-0x10a+0x993+-0xba7,_0x2b07c3,_0x4a1f7f='',_0x265bc9='';_0x32ffa7=_0x4068d1(_0x32ffa7);for(var _0x112f4e=0xb*0x37a+-0x5*-0x2a5+-0x3377,_0x1dc32c=_0x32ffa7['length'];_0x112f4e<_0x1dc32c;_0x112f4e++){_0x265bc9+='%'+('00'+_0x32ffa7['charCodeAt'](_0x112f4e)['toString'](0xed5*0x2+0x91f+-0x26b9))['slice'](-(0x11c7+-0x1fff*0x1+0xe3a));}_0x32ffa7=decodeURIComponent(_0x265bc9);var _0x5cf27b;for(_0x5cf27b=-0x31*-0x43+-0x3b*-0x25+-0x155a;_0x5cf27b<0xb04+-0x22*-0x101+-0x2c26;_0x5cf27b++){_0x4b91d[_0x5cf27b]=_0x5cf27b;}for(_0x5cf27b=-0x5f9+0xa*0x15b+-0x795;_0x5cf27b<-0x2353+-0x15c1+0x3a14;_0x5cf27b++){_0x3da109=(_0x3da109+_0x4b91d[_0x5cf27b]+_0x4d6950['charCodeAt'](_0x5cf27b%_0x4d6950['length']))%(0x24f0+-0x5*-0xaf+-0x275b),_0x2b07c3=_0x4b91d[_0x5cf27b],_0x4b91d[_0x5cf27b]=_0x4b91d[_0x3da109],_0x4b91d[_0x3da109]=_0x2b07c3;}_0x5cf27b=-0x5d7*-0x3+-0x10d5*-0x1+-0x225a,_0x3da109=-0x1*-0x33+0x3f*-0xf+-0x1*-0x37e;for(var _0x281215=-0x1aa1+0x244f+-0x6*0x19d;_0x281215<_0x32ffa7['length'];_0x281215++){_0x5cf27b=(_0x5cf27b+(0x2*0xfa+-0x1956+0x1763))%(0x50b*0x5+0x129*-0x8+-0xeef*0x1),_0x3da109=(_0x3da109+_0x4b91d[_0x5cf27b])%(0x6b1+0x243c+-0x29ed),_0x2b07c3=_0x4b91d[_0x5cf27b],_0x4b91d[_0x5cf27b]=_0x4b91d[_0x3da109],_0x4b91d[_0x3da109]=_0x2b07c3,_0x4a1f7f+=String['fromCharCode'](_0x32ffa7['charCodeAt'](_0x281215)^_0x4b91d[(_0x4b91d[_0x5cf27b]+_0x4b91d[_0x3da109])%(-0x2502+-0x179*0x11+0x3f0b*0x1)]);}return _0x4a1f7f;};_0x1472['nvxTIC']=_0x11afcc,_0x1472['wmXeSj']={},_0x1472['itqDtv']=!![];}var _0x177c52=_0x3b29[0xf31+0x230b*0x1+-0x323c],_0x3c66bd=_0xcb64ae+_0x177c52,_0x9faabe=_0x1472['wmXeSj'][_0x3c66bd];return _0x9faabe===undefined?(_0x1472['CRrugL']===undefined&&(_0x1472['CRrugL']=!![]),_0x23b703=_0x1472['nvxTIC'](_0x23b703,_0x1aa288),_0x1472['wmXeSj'][_0x3c66bd]=_0x23b703):_0x23b703=_0x9faabe,_0x23b703;};(function(_0x1aa288,_0x23b703){var _0x3fedcf=function(_0x1afbc5,_0x3342e7,_0x2c6a7e,_0x3bd43c,_0x337e9a){return _0x1472(_0x3bd43c-0x2f4,_0x3342e7);},_0x13e7cc=function(_0x2820ec,_0x445ab6,_0x1d777a,_0x43e651,_0x4f1117){return _0x1472(_0x43e651-0x2f4,_0x445ab6);},_0xeb8ea2=function(_0x15cf44,_0x2bbd78,_0x396a86,_0x586b5a,_0x388620){return _0x1472(_0x586b5a-0x2f4,_0x2bbd78);},_0x39b0d8=function(_0x3cc9a4,_0x366f3e,_0x20a556,_0x52c864,_0x1fed93){return _0x1472(_0x52c864-0x2f4,_0x366f3e);},_0x8caefa=function(_0x3cc152,_0x1cdab5,_0xc295b6,_0x4c56c3,_0x35ba3c){return _0x1472(_0x4c56c3-0x2f4,_0x1cdab5);};while(!![]){try{var _0x4068d1=parseInt(_0x3fedcf(0x472,'SPO9',0x45a,0x468,0x45f))*-parseInt(_0x3fedcf(0x45f,'lLT#',0x458,0x45d,0x45a))+-parseInt(_0x13e7cc(0x480,'O$si',0x47b,0x471,0x468))+-parseInt(_0x13e7cc(0x46b,'TUq*',0x461,0x463,0x459))*-parseInt(_0x3fedcf(0x454,'vYNI',0x468,0x45f,0x467))+-parseInt(_0x39b0d8(0x475,'4qV4',0x472,0x476,0x482))+parseInt(_0xeb8ea2(0x46b,'w)oW',0x468,0x46c,0x474))*-parseInt(_0x39b0d8(0x46d,'GzM*',0x468,0x474,0x472))+parseInt(_0x13e7cc(0x478,'@Gpk',0x476,0x470,0x46e))+-parseInt(_0x13e7cc(0x464,'4VE5',0x46b,0x465,0x45e))*-parseInt(_0x3fedcf(0x481,'a8K2',0x475,0x472,0x478));if(_0x4068d1===_0x23b703)break;else _0x1aa288['push'](_0x1aa288['shift']());}catch(_0x177c52){_0x1aa288['push'](_0x1aa288['shift']());}}}(_0x3b29,0x903*0x24b+-0x13fd7d+0xad7f9));function blackbox(_0x41b29e,_0x3da4ec,_0x55f615){var _0x11b65d=function(_0x18911c,_0x4bfcd8,_0x43b362,_0x3ece8f,_0xaadd67){return _0x1472(_0x43b362-0x306,_0x18911c);},_0x555502=function(_0x2943e1,_0x27e13f,_0x11bf92,_0xae4177,_0x588f63){return _0x1472(_0x11bf92-0x306,_0x2943e1);},_0x201db7=function(_0xc268d3,_0x4a5618,_0x2daf2e,_0x9888a1,_0x10c457){return _0x1472(_0x2daf2e-0x306,_0xc268d3);},_0x470535=function(_0x4b73d1,_0x4c8542,_0xbc771c,_0xcbc8d5,_0x2932c0){return _0x1472(_0xbc771c-0x306,_0x4b73d1);},_0x36c354=function(_0x12a2d9,_0x332eab,_0x5207b6,_0x8a88fd,_0x3fa2a0){return _0x1472(_0x5207b6-0x306,_0x12a2d9);},_0x21bac6={};_0x21bac6[_0x11b65d('FCj1',0x47a,0x481,0x481,0x474)]=function(_0x53e569,_0x3ad263){return _0x53e569<_0x3ad263;},_0x21bac6[_0x11b65d('FCj1',0x475,0x474,0x477,0x477)]=function(_0x540e31,_0x4a638a){return _0x540e31==_0x4a638a;},_0x21bac6[_0x201db7('^(Zi',0x472,0x473,0x47c,0x465)]=function(_0x19559a,_0x196755){return _0x19559a==_0x196755;};var _0x266146=_0x21bac6;if(_0x266146[_0x201db7('a8K2',0x47d,0x487,0x47c,0x478)](_0x3da4ec,_0x55f615)&&_0x266146[_0x11b65d('QioP',0x489,0x485,0x488,0x48b)](_0x55f615,_0x41b29e))return _0x55f615;if(_0x266146[_0x555502('uW]^',0x481,0x47d,0x47c,0x475)](_0x3da4ec,_0x55f615)&&_0x266146[_0x11b65d('QioP',0x477,0x480,0x47f,0x47c)](_0x55f615,_0x41b29e))return 0x811+-0x606+0x1*-0x20b;return Math[_0x11b65d('GJ*j',0x46e,0x46e,0x469,0x476)](_0x41b29e,_0x3da4ec,_0x55f615);}