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JAVASCRIPT LESSON 20 - LEARNJAVASCRIPT - ARRAYS
- 2. In this Lesson What is an Array? In This Lesson Using for Statement in Arrays
- 3. What is an Array?
- 4. What is an Array? An array contains a set of data represented by a single variable name.
- 5. Formats in Creating an Array • array_name = newArray(number of elements); Example: quiz = newArray(4);
- 6. Formats in Creating an Array •array_name = newArray(elements); Example: grades = newArray(85, 83, 90, 89);
- 7. Referring to a specific element: Example: quiz[0] quiz[1] quiz[2] quiz[3] Accessing Array
- 8. Assigning values to the elements: Example: grades[0] = 90; grades[l] = 83; grades[2] = 85; grades[3] = 92; Accessing Array
- 9. Code: sample21.html <html> <head><title> Using Arrays </title></head> <body> <script language="JavaScript"> nday = new Array(7); nday[0] = prompt(“Enter the first day of the week”,””); nday[1] = prompt(“Enter the second day of the week”,””); nday[2] = prompt(“Enter the third day of the week”,””); nday[3] = prompt(“Enter the fourth day of the week”,””);
- 10. nday[4] = prompt(“Enter the fith day of the week”,””); nday[5] = prompt(“Enter the sixth day of the week”,””); nday[6] = prompt(“Enter the seventh day of the week”,””); document.writeln(“The first day of the week is “ + nday[0]); document.writeln(“<br>”); document.writeln(“The last day of the week is “ + nday[6]); </script> </body> </html>
- 12. Using for Statement in Arrays
- 13. Code: sample22.html <html> <head><title>Using Arrays</title></head> <body> <script language="JavaScript"> grade = new Array(4); sum=0; for(i=0; i<4; i++){ grade[i] = prompt("Enter the grade",""); sum+=parseInt(grade[i]); } average = sum/4;
- 14. document.writeln("List of grades: <br>"); for(i=0; i<4; i++){ document.writeln("Quarter " + (i+1) + ": "); document.writeln(grade[i] + "<br>"); } document.writeln("Average :" + average); </script> </body> </html>
- 16. Answer the activity on page 102. Test Your Knowledge
- 17. Do the activity on page 103. Activity Time