Similar to SQL's NVL function, but with an optional condition to

NullValueLogicWithCondition.js

// null value logic - condition provided
function nvlc(input, alternative, condition=null) {
    "use strict";
    if (condition != null) {
      if (condition(input)) {
          return input;
      } else {
          return alternative;
      }
    } else {
      if (input === null) {
        return alternative
      } else {
        return input;
      }
    }
}

console.log(nvlc(-3, 5, (i) => {i > 0}));           // returns 5
console.log(nvlc([], [0], (i) => {i.length > 0}));  // returns [ 0 ]
console.log(nvlc(null, 3));                         // returns 3
console.log(nvlc(42, 5));                           // returns 42