function get_primes(arr) { var f = function(x) {
if( x == 1 ) return 0; var index = 2; while(index < x) { if( 0 == x % index){ return 0;} index++; } return 1; }; return arr.filter(f);
}
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jiangqr
function get_primes(arr) { var f = function(x) {
}