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CODE EXAMPLE FOR JAVASCRIPT
how to count duplicates in an array javascript
arr
.
reduce
(
(
b
,
c
)
=>
(
(
b
[
b
.
findIndex
(
d
=>
d
.
el
===
c
)
]
||
b
[
b
.
push
(
{
el
:
c
,
count
:
0
}
)
-
1
]
)
.
count
++
,
b
)
,
[
]
)
;
Source by gist.github.com #
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Tagged:
#count
#duplicates
#array
#javascript
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