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javascripttypescriptconsoledeno

Read value logged to the console in Deno

How can I read a value logged to the console in Deno? I'm trying to write a test that checks if a function logs the right value to console.

I've already tried this, but it can only read values manually typed into stdin. Getting values from Deno stdin

Solution

  • This is more of a hack but works in my case

    class BinarySearchTree<T> {
// ...
inOrderPrint() {
    if (this.left) {
      this.left.inOrderPrint();
    }
    console.log(this.value);
    if (this.right) {
      this.right.inOrderPrint();
    }
  }
// ...
}


test("BST: should print elements in order", () => {
  let a = [];
  const log = console.log;
  console.log = x => {
    a.push(x);
  };
  const bst = new BinarySearchTree<number>(1);
  bst.insert(8);
  bst.insert(5);
  bst.insert(7);
  bst.insert(6);
  bst.insert(3);
  bst.insert(4);
  bst.insert(2);
  bst.inOrderPrint();
  console.log = log;
  assertEquals(a.join(""), "12345678");
});