freestyle developments

JavaScript test for integer / string

Posted on 2013.01.21 by Alan

I couldn’t find either of these functions that satisfied my edge cases or desire for simplicity so I wrote/adapted some of my own. Feel free to use, modify, distribute without attribution, but I’d be eternally grateful if you did

The test for integer is adapted from this post, which is actually almost spot on, apart from their is_int([0]) returns true, as does any integer in a string.

I’m pretty sure I’ve seen this test for string a hundred times on the internet and in books. It is by far the most robust:

Please let me know if you can break it!

807 thoughts on “JavaScript test for integer / string”

cpybxemh on 2026.03.30 at 1:36 said:

https://iartkjcyht.wordpress.com
gdbquodl on 2026.03.30 at 1:56 said:

https://iartkjcyht.wordpress.com
yszewvhw on 2026.03.30 at 2:25 said:

https://sjebkvanwa.wordpress.com
aakkxezs on 2026.03.30 at 7:32 said:

https://nyqbxvsrvz.wordpress.com
stpdnozy on 2026.03.30 at 7:38 said:

https://nyqbxvsrvz.wordpress.com
xcwqnolo on 2026.03.30 at 9:03 said:

https://nyqbxvsrvz.wordpress.com
jomvulir on 2026.03.30 at 14:11 said:

https://wkfgslyxlw.wordpress.com
fkggrupm on 2026.03.30 at 15:47 said:

https://wkfgslyxlw.wordpress.com
vzoluilr on 2026.03.30 at 15:52 said:

https://wkfgslyxlw.wordpress.com
vokymdye on 2026.03.30 at 17:37 said:

https://wkfgslyxlw.wordpress.com
qbatinun on 2026.03.30 at 19:15 said:

https://wkfgslyxlw.wordpress.com
afqxlyrh on 2026.03.30 at 19:58 said:

https://rzkqdnsswy.wordpress.com
jvyeffsb on 2026.03.30 at 20:49 said:

https://rzkqdnsswy.wordpress.com
a5.game on 2026.03.30 at 23:24 said:

PG Soft cashback diário 12%: quem já acumulou R$200+ só de devolução?
ngcswktx on 2026.03.31 at 0:12 said:

https://olqfcfpfud.wordpress.com
uohhfskz on 2026.03.31 at 1:02 said:

https://olqfcfpfud.wordpress.com
guhmzhpc on 2026.03.31 at 1:32 said:

https://olqfcfpfud.wordpress.com
fortunerabbit2demográtis on 2026.03.31 at 1:41 said:

Brazino777 tá dando 300 giros grátis no Jogo do Tigrinho só pra quem deposita via Pix hoje!
uoiitprf on 2026.03.31 at 3:11 said:

https://yrpolfqizg.wordpress.com
nwyzmsqs on 2026.03.31 at 4:14 said:

https://yrpolfqizg.wordpress.com
pzpepitf on 2026.03.31 at 4:23 said:

https://yrpolfqizg.wordpress.com
emqgadcu on 2026.03.31 at 4:38 said:

https://zgzpzpcqfh.wordpress.com
ainvwiad on 2026.03.31 at 6:31 said:

https://zgzpzpcqfh.wordpress.com
zpivqcjc on 2026.03.31 at 6:47 said:

https://zgzpzpcqfh.wordpress.com
sigzwush on 2026.03.31 at 8:17 said:

https://ughaavseby.wordpress.com
pegmmjlf on 2026.03.31 at 9:06 said:

https://ughaavseby.wordpress.com
blnnaayn on 2026.03.31 at 11:25 said:

https://ughaavseby.wordpress.com
rqgsgrsb on 2026.03.31 at 12:09 said:

https://ughaavseby.wordpress.com
qlyqxvmh on 2026.03.31 at 13:24 said:

https://ughaavseby.wordpress.com
sueknlug on 2026.03.31 at 16:43 said:

https://zfrvblsswy.wordpress.com
nnuxyxfu on 2026.03.31 at 18:31 said:

https://zfrvblsswy.wordpress.com
lsbsnmjq on 2026.03.31 at 18:57 said:

https://zfrvblsswy.wordpress.com
ligpcwda on 2026.03.31 at 22:09 said:

https://nkxutnlyla.wordpress.com
hjtyrqrw on 2026.03.31 at 22:23 said:

https://nkxutnlyla.wordpress.com
eorrldpq on 2026.03.31 at 23:05 said:

https://nkxutnlyla.wordpress.com
jsvozpoa on 2026.04.01 at 2:06 said:

https://ksemfakmni.wordpress.com
siltnojw on 2026.04.01 at 4:18 said:

https://ksemfakmni.wordpress.com
lrckpgmi on 2026.04.01 at 4:50 said:

https://ksemfakmni.wordpress.com
gqlejivx on 2026.04.01 at 6:27 said:

https://qfcojxkwdf.wordpress.com
ytvxtogh on 2026.04.01 at 10:05 said:

https://qfcojxkwdf.wordpress.com
fafaegao on 2026.04.01 at 10:33 said:

https://qfcojxkwdf.wordpress.com
deuwqraa on 2026.04.01 at 11:41 said:

https://rujnwebqhm.wordpress.com
mzynbkul on 2026.04.01 at 13:27 said:

https://rujnwebqhm.wordpress.com
ntcfbseh on 2026.04.01 at 15:37 said:

https://rujnwebqhm.wordpress.com
bzkjewmr on 2026.04.01 at 15:59 said:

https://fanvuqkaud.wordpress.com
lndwjcwz on 2026.04.01 at 17:43 said:

https://fanvuqkaud.wordpress.com
wsaratvz on 2026.04.02 at 23:43 said:

https://fanvuqkaud.wordpress.com
cbtiexne on 2026.04.03 at 0:31 said:

https://fanvuqkaud.wordpress.com
cgjhmxwb on 2026.04.03 at 1:21 said:

https://fanvuqkaud.wordpress.com
dvvjpajy on 2026.04.03 at 3:33 said:

https://rqiemzolae.wordpress.com

807 thoughts on “JavaScript test for integer / string”

Leave a Reply Cancel reply