jerryscript/tests/jerry/array-prototype-slice.js

// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// This test will not pass on FLOAT32 due to precision issues

var array = [54, undefined, "Lemon", -127];

var array1 = array.slice();
var array2 = array.slice("a", "3");
var array3 = array.slice(-2);
var array4 = array.slice(-12, undefined);
var array5 = array.slice(undefined, -3);
var array6 = array.slice(Infinity, NaN);
var array7 = array.slice(-Infinity, Infinity);
var array8 = array.slice(NaN, -Infinity);

assert (array1.length == 4);
assert (array1[0] == 54);
assert (array1[1] == undefined);
assert (array1[2] == "Lemon");
assert (array1[3] == -127);

assert (array2.length == 3);
assert (array2[0] == 54);
assert (array2[1] == undefined);
assert (array2[2] == "Lemon");

assert (array3.length == 2);
assert (array3[0] == "Lemon");
assert (array3[1] == -127);

assert (array4.length == 4);
assert (array4[0] == 54);
assert (array4[1] == undefined);
assert (array4[2] == "Lemon");
assert (array4[3] == -127);

assert (array5.length == 1);
assert (array5[0] == 54);

assert (array6.length == 0);

assert (array7.length == 4);
assert (array7[0] == 54);
assert (array7[1] == undefined);
assert (array7[2] == "Lemon");
assert (array7[3] == -127);

assert (array8.length == 0);

var array = [];
array[4294967293] = "foo";
array.length = 4294967295;
var result = array.slice(4294967293, -1)
assert(result.length === 1)
assert(result[0] === "foo")

array[0] = "bar";
var result = array.slice(-4294967295, -4294967294)
assert(result.length === 1)
assert(result[0] === "bar")

var array = [];
array[0] = "foo";
var result = array.slice(4294967296, 4294967297);
assert(result.length === 0);

array[4294967293] = "bar";
var result = array.slice(-4294967297, -4294967296);
assert(result.length === 0);

var arr = [1,2];
Array.prototype[0] = 3;
var newArr = arr.slice(0, 1);
delete Array.prototype[0];
assert(newArr.hasOwnProperty("0"));
assert(newArr[0] === 1);

// Checking behavior when unable to get length
var obj = { slice : Array.prototype.slice };
Object.defineProperty(obj, 'length', { 'get' : function () { throw new ReferenceError ("foo"); } });

try {
  obj.slice(1, 2);
  assert (false);
} catch (e) {
  assert (e.message === "foo");
  assert (e instanceof ReferenceError);
}

// Checking behavior when unable to get element
var obj = { length : 1, slice : Array.prototype.slice };
Object.defineProperty(obj, '0', { 'get' : function () { throw new ReferenceError ("foo"); } });

try {
  obj.slice(0, 1);
  assert (false);
} catch (e) {
  assert (e.message === "foo");
  assert (e instanceof ReferenceError);
}

/* ES v5.1 15.4.4.10.5.
   Checking behavior when start value throws exception */
var arg1 = { };
Object.defineProperty(arg1, 'valueOf', { 'get' : function () { throw new ReferenceError ("foo"); } });
var obj = { slice : Array.prototype.slice };

try {
  obj.slice(arg1);
  assert(false);
} catch (e) {
  assert(e.message === 'foo');
  assert(e instanceof ReferenceError);
}

/* ES v5.1 15.4.4.10.7.
   Checking behavior when end value throws exception */
var arg2 = { };
Object.defineProperty(arg2, 'valueOf', { 'get' : function () { throw new ReferenceError ("foo"); } });
var obj = { slice : Array.prototype.slice };

try {
  obj.slice(0, arg2);
  assert(false);
} catch (e) {
  assert(e.message === 'foo');
  assert(e instanceof ReferenceError);
}

/* ES v5.1 15.4.4.10.10.
   Checking behavior when unable to get element */
var obj = { length : 3, slice : Array.prototype.slice };
Object.defineProperty(obj, '1', { 'get' : function () { throw new ReferenceError ("foo"); } });

try {
  obj.slice(0, 3);
  assert (false);
} catch (e) {
  assert (e.message === "foo");
  assert (e instanceof ReferenceError);
}

function array_check(result_array, expected_array) {
  assert(result_array instanceof Array);
  assert(result_array.length === expected_array.length);
  for (var idx = 0; idx < expected_array.length; idx++) {
    assert(result_array[idx] === expected_array[idx]);
  }
}

// Remove the buffer
var array = [1, 2, 3, 4, 5];
var value = array.slice(4, {
    valueOf: function() {
        array.length = 0;
    }
})

array_check(value, []);

// Extend the buffer
var array = [1, 2, 3, 4, 5];
var value = array.slice(6, {
    valueOf: function() {
        array.length = 10;
    }
})

array_check(value, []);

// Reduce the buffer
var array = [1, 2, 3, 4, 5];
var value = array.slice(1, {
    valueOf: function() {
        array.length = 3;
    }
})

array_check(value, []);

// Constructor creates longer array than expected.
class LongArray extends Array {
  constructor(len) {
      super (42);
      this.fill ("foo");
  }
}

var a = new LongArray (5);
a.length = 5;
var sliced = a.slice ();
assert (sliced.length == 5);
assert (JSON.stringify (sliced) == '["foo","foo","foo","foo","foo"]')

// Constructor creates shorter array than expected.
class ShortArray extends Array {
  constructor(len) {
      super (2);
      this.fill ("bar");
  }
}

var b = new ShortArray (8);
b.length = 8;
b.fill ("asd", 2);
var sliced2 = b.slice ();
assert (sliced2.length == 8);
assert (JSON.stringify (sliced2) == '["bar","bar","asd","asd","asd","asd","asd","asd"]');

// Constructor creates array of the expected size.
class ExactArray extends Array {
  constructor(len) {
      super (len);
      this.fill ("baz");
  }
}

var c = new ExactArray (5);
var sliced3 = c.slice();
assert (sliced3.length == 5);
assert (JSON.stringify (sliced3) == '["baz","baz","baz","baz","baz"]');