v8/test/mjsunit/const-declaration.js

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// Flags: --legacy-const

// Test handling of const variables in various settings.

(function () {
  function f() {
    function g() {
      x = 42;  //  should be ignored
      return x;  // force x into context
    }
    x = 43;  // should be ignored
    assertEquals(undefined, g());
    x = 44;  // should be ignored
    const x = 0;
    x = 45;  // should be ignored
    assertEquals(0, g());
  }
  f();
})();


(function () {
  function f() {
    function g() {
      with ({foo: 0}) {
        x = 42;  //  should be ignored
        return x;  // force x into context
      }
    }
    x = 43;  // should be ignored
    assertEquals(undefined, g());
    x = 44;  // should be ignored
    const x = 0;
    x = 45;  // should be ignored
    assertEquals(0, g());
  }
  f();
})();


(function () {
  function f() {
    function g(s) {
      eval(s);
      return x;  // force x into context
    }
    x = 43;  // should be ignored
    assertEquals(undefined, g("x = 42;"));
    x = 44;  // should be ignored
    const x = 0;
    x = 45;  // should be ignored
    assertEquals(0, g("x = 46;"));
  }
  f();
})();


(function () {
  function f() {
    function g(s) {
      with ({foo: 0}) {
        eval(s);
        return x;  // force x into context
      }
    }
    x = 43;  // should be ignored
    assertEquals(undefined, g("x = 42;"));
    x = 44;  // should be ignored
    const x = 0;
    x = 45;  // should be ignored
    assertEquals(0, g("x = 46;"));
  }
  f();
})();


(function () {
  function f(s) {
    function g() {
      x = 42;  // assign to global x, or to const x
      return x;
    }
    x = 43;  // declare global x
    assertEquals(42, g());
    x = 44;  // assign to global x
    eval(s);
    x = 45;  // should be ignored (assign to const x)
    assertEquals(0, g());
  }
  f("const x = 0;");
})();


(function () {
  function f(s) {
    function g() {
      with ({foo: 0}) {
        x = 42;  // assign to global x, or to const x
        return x;
      }
    }
    x = 43;  // declare global x
    assertEquals(42, g());
    x = 44;  // assign to global x
    eval(s);
    x = 45;  // should be ignored (assign to const x)
    assertEquals(0, g());
  }
  f("const x = 0;");
})();


(function () {
  function f(s) {
    function g(s) {
      eval(s);
      return x;
    }
    x = 43;  // declare global x
    assertEquals(42, g("x = 42;"));
    x = 44;  // assign to global x
    eval(s);
    x = 45;  // should be ignored (assign to const x)
    assertEquals(0, g("x = 46;"));
  }
  f("const x = 0;");
})();


(function () {
  function f(s) {
    function g(s) {
      with ({foo: 0}) {
        eval(s);
        return x;
      }
    }
    x = 43;  // declare global x
    assertEquals(42, g("x = 42;"));
    x = 44;  // assign to global x
    eval(s);
    x = 45;  // should be ignored (assign to const x)
    assertEquals(0, g("x = 46;"));
  }
  f("const x = 0;");
})();