Find values in JSON by key, recursively

find_values.js

function findValues(obj, key){
	return findValuesHelper(obj, key, []);
}

function findValuesHelper(obj, key, list) {
  if (!obj) return list;
  if (obj instanceof Array) {
    for (var i in obj) {
        list = list.concat(findValuesHelper(obj[i], key, []));
    }
    return list;
  }
  if (obj[key]) list.push(obj[key]);

  if ((typeof obj == "object") && (obj !== null) ){
	  var children = Object.keys(obj);
	  if (children.length > 0){
	  	for (i = 0; i < children.length; i++ ){
	        list = list.concat(findValuesHelper(obj[children[i]], key, []));
	  	}
	  }
  }
  return list;
}

Thank you so much!

TS version indeed:

findValuesHelper(obj, key) {
        let list = [ ];
        if (!obj) return list;
        if (obj instanceof Array) {
            for (var i in obj) {
                list = list.concat(this.findValuesHelper(obj[i], key));
            }
            return list;
        }
        if (obj[key]) list.push(obj[key]);

        if ((typeof obj == "object") && (obj !== null)) {
            let children = Object.keys(obj);
            if (children.length > 0) {
                for (let i = 0; i < children.length; i++) {
                    list = list.concat(this.findValuesHelper(obj[children[i]], key));
                }
            }
        }
        return list;
    }