JavaScript: Find the most frequent word in a string
JavaScript String: Exercise-59 with Solution
Write a JavaScript program to find the most frequent word in a given string.
Test Data:
("The quick brown fox jumps over the lazy dog") -> "the"
("Python is a high-level, general-purpose programming language.") -> "python"
(" It was the same man, she was sure of it. It's always the same, Chauncey.") -> "was"
(12321) -> "It must be a string."
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to find the most frequent word in a string</title>
</head>
<body>
</body>
</html>
JavaScript Code:
const test = (text) => {
if (text.length === 0)
{
return 'String should not be empty!'
}
if (typeof text !== 'string')
{
return 'It must be a string.'
}
const data = text.split(' ')
if (data.length < 2) {
return data[0]
}
const words = text.split(' ')
if (words.length < 2) {
return words[0]
}
const temp = {}
words.forEach(word => {
temp[word.toLocaleLowerCase()] = temp[word.toLocaleLowerCase()] + 1 || 1
})
const max = Object.keys(temp).reduce((n, word) => {
if (temp[word] > n.count)
{
return { word, count: temp[word] }
}
else
{
return n
}
}, { word: '', count: 0 })
return max.word
}
console.log(test("The quick brown fox jumps over the lazy dog"))
console.log(test("Python is a high-level, general-purpose programming language."))
console.log(test(" It was the same man, she was sure of it. It's always the same, Chauncey."))
console.log(test(12321))
Sample Output:
the python was It must be a string.
Flowchart:

Live Demo:
See the Pen javascript-string-exercise-59 by w3resource (@w3resource) on CodePen.
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