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Array
​
MDN
​
Test Array
1
Array
.
isArray
(
array
)
Copied!
This does not work to test if its an array.
1
if
(
array
)
{
2
// empty arrays evaluate as false
3
}
4
​
5
if
(
array
&&
array
.
length
>
0
)
{
6
// you may still want to capture the array
7
}
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Clone an array
1
const
clone
=
array
.
slice
(
0
);
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Iterate keys in an array
(for...in)
1
const
array
=
[
'x'
,
'y'
,
'z'
];
2
for
(
const
key
in
array
)
{
3
console
.
log
(
key
);
4
}
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1
0
2
1
3
2
Copied!
​
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
​
Iterate values in an array
(for...of)
1
const
array
=
[
'x'
,
'y'
,
'z'
];
2
for
(
const
value
of
array
)
{
3
console
.
log
(
value
);
4
}
Copied!
1
x
2
y
3
z
Copied!
​
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
​
Appending/merging arrays together
Reuse Array:
1
array1
.
push
(
...
array2
);
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New Array:
1
const
array3
=
array1
.
concat
(
array2
);
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Notes - Previous
JavaScript
Next
Async & Await / Promises
Last modified
2yr ago
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Contents
Test Array
Clone an array
Iterate keys in an array (for...in)
Iterate values in an array (for...of)
Appending/merging arrays together