JavaScript Practice Exercise Five

Question 1 :

How will you Call or Invoke following function?

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function  sayHello() {
      alert("Welcome to TechTIME"); 
}           

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Question 2 :

Create a function named schoolTime.

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   {

      console.log("Welcome to the School on time");



schoolTime();
          

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Question 3 :

Below is the function named addition that takes two arguments num1 and num2. Function will return sum of both numbers in variable result

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function addition(  ,  ) {
      result = num1 + num2
       result ;
}

myValue = addition ( 9  , 22 )
          

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Question 4 :

Below is the function named subtraction that takes two arguments num1 and num2. num2 is set to default value of 9. The function return sum of num1 and 9 numbers in variable result

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function addition( num1 ,  ) {
  result = num1 + num2
   result ;
}
      
myValue = addition ( 128 )
console.log (   );
          

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Question 5 :

Create a function named changeColor that will change the color an element with id glow to blue and background color to orange

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function  changeColor ( arg1 , agr2  ) {

      element = document.querySelector('  ');
      element.style.color             = arg1
      element.style. = arg2 
}

changeColor( 'blue' , 'orange' )
          

Output:

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Question 6 :

Create two functions named changeBgColor and alterBgColor Create a variable chooseBgColor and ask user to assign the name of color to the variable. This variable should be passed into alterBgColor function to alter the provided color. For example if user supplied red it should change the color togreen and vice versa. Returned value from this function should be supplied to changeBgColor function to apply this new altered color on an element h1 in HTML.

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let chooseBgColor = prompt("Enter the color for background (red/green)");

// This function will just apply the provided color
// to element

function changeBgColor(color1) {
  document.querySelector("h1").style.color = color1;
}

// This function will reverse the color
// if user supplies red it will turn it to green
function alterBgColor(color) {
  if (color == "red") {
    color = "green";
    return color;
  } else {
    color = "red";
    return color;
  }
}

// calling the function which can reverse or alter the
// provided color
newBgColor = alterBgColor(chooseBgColor);

// Calling the changeColor function and providing altered color to it
changeBgColor(newBgColor);         
          

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