Learning GoLang with me: Check if the Sentence Is Pangram

A pangram is a sentence where every letter of the English alphabet appears at least once. Given a string sentence containing only lowercase English letters, return true if sentence is a pangram, or false otherwise.

Example 1:
Input: sentence = "thequickbrownfoxjumpsoverthelazydog"
Output: true
Explanation: sentence contains at least one of every letter of the English alphabet.

Example 2:
Input: sentence = "leetcode"
Output: false

Constraints:
1 <= sentence.length <= 1000
sentence consists of lowercase English letters.

Hints:
Iterate over the string and mark each character as found (using a boolean array, bitmask, or any other similar way).
Check if the number of found characters equals the alphabet length.

GoLang: Pangram Algorithm

Using a map with key=rune (alias for character), we mark seen characters in the hash map. It is a Pangram if the size of the map is 26.

func checkIfPangram(sentence string) bool {
    if len(sentence) < 26 {
        return false
    }
    var data = make(map[rune]bool)
    for _, i := range sentence {
        data[i] = true
    }
    return len(data) == 26
}

Using fancy syntax the channel and goroutine in GoLang:

func checkIfPangram(sentence string) bool {
    var ans = make(chan bool)
    go func() {        
        if len(sentence) < 26 {
            ans <- false
            return
        }
        var data = make(map[rune]bool)
        for _, i := range sentence {
            data[i] = true
        }
        ans <- len(data) == 26        
    }()
    return <-ans
}

The channel is a pipe where you can write to and read from. The go func starts a co-routine.

See also: Teaching Kids Programming – Check if the Sentence Is Pangram

Repost to Blog

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