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    main function

    The type and parameter of the main function are optional, the shortest main function is main(){}. The parameters of the main function can be used to declare variables:

    main(argv,b){b=1;…}
    // or
    main(argv,{b=1}){…}
    // instead of
    main(argv){var b=1;…}
    
    main({a,b,c=0}){…}
    // instead of
    main(){var a,b,c=0;…}
    

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