Creating an array of 20 numbers, printing each value as long as they aren't a duplicate, using the smallest array possible?
I need to print out a second array, that takes the numbers from the first array. The second array will only print the number once if it has a duplicate. The code I have now prints the last number of the first array 20 times.... I can't for the life of me figure out how to do this. I hate coming here with simple homework questions but the tu开发者_C百科tor is no help. If you can help me, please include some comments with what your doing, I want to learn this!
<html>
<head>
<title> HW 10.12 </title>
<script type="text/javascript">
var array=new Array(19);
var array2 =new Array();
for(var j=0; j< array.length; j++)
{
array[j]=Math.floor(10 + Math.random()*100);
}
for (var i=0; i < array.length; i++)
for(var k=0; k < array.length; k++)
{
if (array2[k] != array[i])
{
array2[k] = array[i];
}}
document.writeln(array2)
</script>
</head>
<body>
</body>
</html>
I'm going to be super helpful today, just because it's Friday:
var array=new Array(19);
var array2 =new Array();
// Nothing changed here, just some formatting...
for(var j = 0; j < array.length; j++) {
array[j]=Math.floor(10 + Math.random()*100);
}
// Declare a function variable. The function will determine
// whether a value is already contained in the array or not.
var hasValue = function(val,arr) {
// Loop through the array "arr" (passed through as parameter) and
// determine whether the value "val" (also passed through as parameter)
// already exists in the array. If it does, return "true".
for (var i = 0; i < arr.length; i++) {
if (arr[i] == val)
return true;
}
// If, after looping through all items in the array, the value isn't found,
// return "false".
return false;
};
// Loop through the original array.
for (var i = 0; i < array.length; i++) {
// Call the "hasValue" function to determine whether the current item in the
// original array already exists in the new array. If it doesn't, add it to
// the new array.
if (!hasValue(array[i],array2))
array2.push(array[i]);
}
// Nothing changed here...
document.writeln(array2);
Change your javascript to as follows:
var array = new Array(19);
var array2 = new Array();
for (var j = 0; j < array.length; j++) {
array[j] = Math.floor(10 + Math.random() * 100);
}
var isDuplicate = false;
for (var i = 0; i < array.length; i++) {
isDuplicate = false;
for (var k = 0; k < array.length; k++) {
if (array2[k] == array[i]) { //Check if this current value of array1 exists in array2
//If yes then we should ignore this value
// hence mark isDuplicate as true.
isDuplicate = true;
break; //Break from loop as we don't need to check any further
}
}
if(!isDuplicate ) //if isDuplicate is not true this value is unique. Push it to array2
array2.push(array[i]);
}
document.writeln(array2)
加载中,请稍侯......
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