ladybird/Libraries/LibJS/Tests/builtins/Array/array-basic.js

load("test-common.js");

try {
  var a = [1, 2, 3];

  assert(typeof a === "object");
  assert(a.length === 3);
  assert(a[0] === 1);
  assert(a[1] === 2);
  assert(a[2] === 3);

  a[1] = 5;
  assert(a[1] === 5);
  assert(a.length === 3);

  a.push(7);
  assert(a[3] === 7);
  assert(a.length === 4);

  a = [,];
  assert(a.length === 1);
  assert(a.toString() === "");
  assert(a[0] === undefined);

  a = [, , , ,];
  assert(a.length === 4);
  assert(a.toString() === ",,,");
  assert(a[0] === undefined);
  assert(a[1] === undefined);
  assert(a[2] === undefined);
  assert(a[3] === undefined);

  a = [1, , 2, , , 3];
  assert(a.length === 6);
  assert(a.toString() === "1,,2,,,3");
  assert(a[0] === 1);
  assert(a[1] === undefined);
  assert(a[2] === 2);
  assert(a[3] === undefined);
  assert(a[4] === undefined);
  assert(a[5] === 3);

  a = [1, , 2, , , 3];
  Object.defineProperty(a, 1, {
    get() {
      return this.secret_prop;
    },
    set(value) {
      this.secret_prop = value;
    },
  });
  assert(a.length === 6);
  assert(a.toString() === "1,,2,,,3");
  assert(a.secret_prop === undefined);
  a[1] = 20;
  assert(a.length === 6);
  assert(a.toString() === "1,20,2,,,3");
  assert(a.secret_prop === 20);

  console.log("PASS");
} catch (e) {
  console.log("FAIL: " + e);
}