JavaScript: Find the most frequent item of an array
JavaScript Array: Exercise-8 with Solution
Write a JavaScript program to find the most frequent item of an array.
Sample array: var arr1=[3, 'a', 'a', 'a', 2, 3, 'a', 3, 'a', 2, 4, 9, 3];
Sample Output: a ( 5 times )
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Write a JavaScript program to find the most frequent item of an array. - w3resource</title>
</head>
<body>
</body>
</html>
JavaScript Code:
var arr1=[3, 'a', 'a', 'a', 2, 3, 'a', 3, 'a', 2, 4, 9, 3];
var mf = 1;
var m = 0;
var item;
for (var i=0; i<arr1.length; i++)
{
for (var j=i; j<arr1.length; j++)
{
if (arr1[i] == arr1[j])
m++;
if (mf<m)
{
mf=m;
item = arr1[i];
}
}
m=0;
}
console.log(item+" ( " +mf +" times ) ") ;
Sample Output:
a ( 5 times )
Flowchart:
ES6 Version:
const arr1=[3, 'a', 'a', 'a', 2, 3, 'a', 3, 'a', 2, 4, 9, 3];
let mf = 1;
let m = 0;
let item;
for (let i=0; i<arr1.length; i++)
{
for (let j=i; j<arr1.length; j++)
{
if (arr1[i] == arr1[j])
m++;
if (mf<m)
{
mf=m;
item = arr1[i];
}
}
m=0;
}
console.log(`${item} ( ${mf} times ) `) ;
Live Demo:
See the Pen JavaScript - Find the most frequent item of an array- array-ex- 8 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to sort the items of an array.
Next: Write a JavaScript program which accept a string as input and swap the case of each character.
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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