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es.array.splice.js
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es.array.splice.js
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'use strict'
;
var
$
=
require
(
'../internals/export'
);
var
toObject
=
require
(
'../internals/to-object'
);
var
toAbsoluteIndex
=
require
(
'../internals/to-absolute-index'
);
var
toIntegerOrInfinity
=
require
(
'../internals/to-integer-or-infinity'
);
var
lengthOfArrayLike
=
require
(
'../internals/length-of-array-like'
);
var
doesNotExceedSafeInteger
=
require
(
'../internals/does-not-exceed-safe-integer'
);
var
arraySpeciesCreate
=
require
(
'../internals/array-species-create'
);
var
createProperty
=
require
(
'../internals/create-property'
);
var
deletePropertyOrThrow
=
require
(
'../internals/delete-property-or-throw'
);
var
arrayMethodHasSpeciesSupport
=
require
(
'../internals/array-method-has-species-support'
);
var
HAS_SPECIES_SUPPORT
=
arrayMethodHasSpeciesSupport
(
'splice'
);
var
max
=
Math
.
max
;
var
min
=
Math
.
min
;
// `Array.prototype.splice` method
// https://tc39.es/ecma262/#sec-array.prototype.splice
// with adding support of @@species
$
({
target
:
'Array'
,
proto
:
true
,
forced
:
!
HAS_SPECIES_SUPPORT
},
{
splice
:
function
splice
(
start
,
deleteCount
/* , ...items */
)
{
var
O
=
toObject
(
this
);
var
len
=
lengthOfArrayLike
(
O
);
var
actualStart
=
toAbsoluteIndex
(
start
,
len
);
var
argumentsLength
=
arguments
.
length
;
var
insertCount
,
actualDeleteCount
,
A
,
k
,
from
,
to
;
if
(
argumentsLength
===
0
)
{
insertCount
=
actualDeleteCount
=
0
;
}
else
if
(
argumentsLength
===
1
)
{
insertCount
=
0
;
actualDeleteCount
=
len
-
actualStart
;
}
else
{
insertCount
=
argumentsLength
-
2
;
actualDeleteCount
=
min
(
max
(
toIntegerOrInfinity
(
deleteCount
),
0
),
len
-
actualStart
);
}
doesNotExceedSafeInteger
(
len
+
insertCount
-
actualDeleteCount
);
A
=
arraySpeciesCreate
(
O
,
actualDeleteCount
);
for
(
k
=
0
;
k
<
actualDeleteCount
;
k
++
)
{
from
=
actualStart
+
k
;
if
(
from
in
O
)
createProperty
(
A
,
k
,
O
[
from
]);
}
A
.
length
=
actualDeleteCount
;
if
(
insertCount
<
actualDeleteCount
)
{
for
(
k
=
actualStart
;
k
<
len
-
actualDeleteCount
;
k
++
)
{
from
=
k
+
actualDeleteCount
;
to
=
k
+
insertCount
;
if
(
from
in
O
)
O
[
to
]
=
O
[
from
];
else
deletePropertyOrThrow
(
O
,
to
);
}
for
(
k
=
len
;
k
>
len
-
actualDeleteCount
+
insertCount
;
k
--
)
deletePropertyOrThrow
(
O
,
k
-
1
);
}
else
if
(
insertCount
>
actualDeleteCount
)
{
for
(
k
=
len
-
actualDeleteCount
;
k
>
actualStart
;
k
--
)
{
from
=
k
+
actualDeleteCount
-
1
;
to
=
k
+
insertCount
-
1
;
if
(
from
in
O
)
O
[
to
]
=
O
[
from
];
else
deletePropertyOrThrow
(
O
,
to
);
}
}
for
(
k
=
0
;
k
<
insertCount
;
k
++
)
{
O
[
k
+
actualStart
]
=
arguments
[
k
+
2
];
}
O
.
length
=
len
-
actualDeleteCount
+
insertCount
;
return
A
;
}
});
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