Javascript function that is equivalent for PHP function -

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this question has answer here:

i have follwing code in php:

if(is_numeric($first_name[0]) === true){    //do }

how able same check using javascript? php script check if there number in $first_name @ all, don't want user add number in first or last names please?

use regular expressions.

if (/-?\d+(?:\.\d*)?(?:[ee][+\-]?\d+)?/.test(yourinput)) {    // }

of course, work on strings. different method, see duplicate question:

function isnumber(n) {   return !isnan(parsefloat(n)) && isfinite(n); }

to check if input contains number (0-9) @ all, regex works again:

if (/[0-9]+/.test(yourinput)) {    // }

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