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JavaScript-Interview-Question/Polyfill-Filter.js at master · plopfizz/JavaScript-Interview-Question · GitHub
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Polyfill-Filter.js
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JavaScript-Interview-Question
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Polyfill-Filter.js
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// Implement the polyfill for the Filter() function in JavaScript.
const
array
=
[
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
]
;
Array
.
prototype
.
myFilter
=
function
(
fn
)
{
newArray
=
[
]
;
let
obj
=
this
;
for
(
let
index
=
0
;
index
<
obj
.
length
;
index
++
)
{
if
(
fn
(
obj
[
index
]
)
)
{
newArray
.
push
(
obj
[
index
]
)
;
}
}
return
newArray
;
}
;
const
output
=
array
.
myFilter
(
(
item
)
=>
{
return
item
%
2
===
0
;
}
)
;
console
.
log
(
output
)
;
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