Method propose

src/runtime/join.ts:682–700

(multiIndex: MultiIndex, prefix)

  }

  propose(multiIndex: MultiIndex, prefix) {
    // if either our inputs aren't resolved or our outputs are all filled
    // in, then we don't have anything to propose
    if(!fullyResolved(this.args, prefix)
       || fullyResolved(this.outputs, prefix)) return;

     // find out which of our outputs we could propose a value for
     let proposed;
     let proposedIx = 0;
     for(let ret of this.outputs) {
       if(toValue(ret, prefix) === undefined) {
         proposed = ret;
         break;
       }
       proposedIx++;
     }

     return this.getProposal(multiIndex, proposed, proposedIx, prefix);
  }

  resolveProposal(proposal, prefix) {
    return proposal.index;