rust:
Performance counter stats for './target/release/fl':

       4599,845765      task-clock (msec)         #    0,999 CPUs utilized
               113      context-switches          #    0,025 K/sec
                 0      cpu-migrations            #    0,000 K/sec
               180      page-faults               #    0,039 K/sec
        9176424342      cycles                    #    1,995 GHz
   <not supported>      stalled-cycles-frontend
   <not supported>      stalled-cycles-backend
       20897696040      instructions              #    2,28  insns per cycle
        4407729141      branches                  #  958,234 M/sec
          96665839      branch-misses             #    2,19% of all branches

       4,602782304 seconds time elapsed


Go:

Performance counter stats for './main':

       3171,965381      task-clock (msec)         #    1,001 CPUs utilized
               394      context-switches          #    0,124 K/sec
                18      cpu-migrations            #    0,006 K/sec
              1319      page-faults               #    0,416 K/sec
        6325636319      cycles                    #    1,994 GHz
   <not supported>      stalled-cycles-frontend
   <not supported>      stalled-cycles-backend
       12869003798      instructions              #    2,03  insns per cycle
        2733416891      branches                  #  861,742 M/sec
          42743835      branch-misses             #    1,56% of all branches

       3,168397273 seconds time elapsed


Rust code:

use std::io;
use std::io::BufReader;
use std::io::BufRead;
use std::fs::File;

fn main() {
    let f = File::open("www.js").unwrap();
    let mut file = BufReader::new(&f);
    let mut buffer = String::new();
    let mut count = 0;

    for line in file.lines() {
        let l = line.unwrap();
        if l.contains("array") {
            count += 1;
        }
    }


   println!("{}", count);
}


Go code:

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"runtime"
	"strings"
)

func main() {

file, err := os.Open("www.js")
	if err != nil {
		log.Fatal(err)
	}
	count := 0
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		if strings.Contains(scanner.Text(), "array") {
			count++
		}
	}

	fmt.Println(count)
}