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adas

//V8 3.31.1

function printCombinations(array, k){
    var combinations = [];
    
    
    function run(level, start){
    
        for(var i=start; i < array.length - k + level + 1; i++){
            combinations[level] = array[i];
            
            if(level < k - 1){
                run(level + 1, i + 1);
            } else {
                print(combinations.join(" "));
            }
        }
        
    }

run(0, 0);
}

printCombinations(["x", "_"], 3);

print("------------");

function printPermutations(array, k){
    var combinations = [];
    var indices = [];
    
    
    function run(level, start){
    
        for(var i=0; i < array.length; i++){
            
            if(!indices[i]){
            
                indices[i] = true;
                
                combinations[level] = array[i];
                
                if(level < k - 1){
                    run(level + 1, i + 1);
                } else {
                    print(combinations.join(" "));
                }
                
                indices[i] = false;
            }
        }
        
    }

run(0, 0);
}

printPermutations([1, 2, 3, 4], 3);


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