Answered Essay: Consider the following JavaScript skeletal program: //the main program var x: function sub1 () { var x: function sub2 () { } } function

CSC 4340 Org. Programming LanguagesFall 2017 1. (50 points) Consider the following JavaScript skeletal program //the main program var X function sub1 0i function sub2(11 function sub3 ) Assume the execution of this program is in the following unit order: main calls subl subl calls sub2 sub2 calls sub3 a. Assuming static scoping, which declaration of x is the correct one for a reference to x in: i. subl ii. sub2 iii. sub3 b. Repeat part a, but assume dynamic scoping 2. (50 points) Assume the following JavaScript program was interpreted using static- scoping rules. What value of x is displayed in function subl? Under dynamic scoping rules, what value of x is displayed in function subl? var X function subl(f />) ; desument..MEAFg(x + + <bE = 羡 functin sub2Of x - 10 subl (); sub2 );

Consider the following JavaScript skeletal program: //the main program var x: function sub1 () { var x: function sub2 () { } } function sub3 () { } Assume the execution of this program is in the following unit order: main calls sub1 sub1 calls sub2 sub2 calls sub3 a. Assuming static scoping, which declaration of x is the correct one for a reference to x in: i. sub1 ii. sub2 iii. sub3 b. Repeat part a, but assume dynamic scoping Assume the following JavaScript program was interpreted using static-scoping rules. What value of x is displayed in function sub1? Under dynamic scoping rules, what value of x is displayed in function sub1? var x: function sub1() { document.write(“x = ” + x + ” “): } fuctin sub2 () { var x: x = 10: sub1(): } x = 5: sub2();

Expert Answer

 

var x = 15; // line1

function sub1() {

var x = 16; // line2

 

function sub2() {

sub3();

}

sub2();

}

function sub3() {

}

sub1()

1.

Static Scoping

in Sub1: line2 gives the reference to x

in Sub2: line2 gives the reference to x

in Sub3: line1 gives the reference to x

2.

Dynamic Scoping

in Sub1: line2 gives the reference to x

in Sub2: line2 gives the reference to x

in Sub3: line2 gives the reference to x, because sub2() calls sub3()

Answer2:

var x;

function sub1() {

// as per dynamic scope, sub1 is called from sub2, hence

// the value of x will come from sub2, which is 10

document.write(“x = ” + x + “<br />”);

}

function sub2() {

var x;

x = 10;

sub1();

}

x = 5;

sub2();

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