How to eliminate if-else when doing different things according to different combinations of boolean value?

for example, suppose I need to do different things according to combinations of boolean values: cond_0,cond_1 and cond_2 :

cond_0 cond_1 cond_2
false  false  false  a();
false  false  true   b();
.
.
.
true   true   true   h();

it looks as if mapping bit numbers to functions:

000:a()
001:b()
.
.
.
111:h()

while the general rule looks like very simple, I don't know how to write it without if-else, and the current form looks like that:

var f=function(cond_0,cond_1,cond_2){
  if(!cond_0 && !cond_1 && !cond_2){
    a();
  }else if( cond_0 && !cond_1 && !cond_2)){
    b();
  }else if(!cond_0 &&  cond_1 && !cond_2)){
    c();
  }else if( cond_0 &&  cond_1 && !cond_2)){
    d();
  }else if(!cond_0 && !cond_1 &&  cond_2)){
    e();
  }else if( cond_0 && !cond_1 &&  cond_2)){
    f();
  }else if(!cond_0 &&  cond_1 &&  cond_2)){
  g();
  }else if( cond_0 &&  cond_1 &&  cond_2)){
    h();
  }
}

which is very long and hard to read. And when a new boolean condition cond_3 is added, it is horrible to modify the code:

if(!cond_0 && !cond_1 && !cond_2 && !cond_3){
    a();
  }else if( cond_0 && !cond_1 && !cond_2 !cond_3)){
    b();
  }
  .
  .
  .

Is there any way to eliminate the if else, so that cond_0 , cond_1 and cond_2 can just appear once only inside the function, and also easy to add new function when cond_3 is added? I want something like:

var f=function(cond_0,cond_1,cond_2){
  var magic=(000:a,001:b,010:c...);
  magic(cond_0,cond_1,cond_2)();
}