%h = hash, $key = keys in …

%h = hash, $key = keys in %h

Sort by key

# if key is int  
    # ascending  
    for $key (sort keys %hash) {say "$key: $hash{$key}";}  

    # descending  
    for $key (reverse sort keys %hash) {say "$key: $hash{$key}";}  

# if key is str (represent number)  
    # ascending  
    for $key (sort {$a <=> $b;} keys %h) {say "$key: $h{$key}";}  

    # descending  
    for $key (sort {$b <=> $a;} keys %h) {say "$key: $h{$key}";}  

Sort by value (int)

    # value of %h is int ($h{$key})  
    # ascending order  
    for $key (sort {$hash{$a} <=> $hash{$b};} keys %h) {say "$key: $h{$key}";}  

    # descending order  
    for $key (sort {$hash{$b} <=> $hash{$a};} keys %h) {say "$key: $h{$key}";}  



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