A JavaScript equivalent of PHP’s in_array
function in_array (needle, haystack, argStrict) {
// http://kevin.vanzonneveld.net
// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + improved by: vlado houba
// + input by: Billy
// + bugfixed by: Brett Zamir (http://brett-zamir.me)
// * example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);
// * returns 1: true
// * example 2: in_array('vlado', {0: 'Kevin', vlado: 'van', 1: 'Zonneveld'});
// * returns 2: false
// * example 3: in_array(1, ['1', '2', '3']);
// * returns 3: true
// * example 3: in_array(1, ['1', '2', '3'], false);
// * returns 3: true
// * example 4: in_array(1, ['1', '2', '3'], true);
// * returns 4: false
var key = '',
strict = !! argStrict;
if (strict) {
for (key in haystack) {
if (haystack[key] === needle) {
return true;
}
}
} else {
for (key in haystack) {
if (haystack[key] == needle) {
return true;
}
}
}
return false;
}
Example 1
in_array('van', ['Kevin', 'van', 'Zonneveld']);
Should return
true
Example 2
in_array('vlado', {0: 'Kevin', vlado: 'van', 1: 'Zonneveld'});
Should return
false
Example 3
in_array(1, ['1', '2', '3']);
in_array(1, ['1', '2', '3'], false);
Should return
true
true