Leetcode - 68. Text Justification

Javascript Code

/**
 * @param {string[]} words
 * @param {number} maxWidth
 * @return {string[]}
 */
var fullJustify = function (words, maxWidth) {
    let finalRes = []
    let strArray = []
    let charCount = 0
    for (let word of words) {
        if (word.length + strArray.length + charCount > maxWidth) {
            finalRes.push(processArr(strArray, maxWidth))
            strArray = []
            charCount = 0
        }
        strArray.push(word)
        charCount += word.length
    }

    finalRes.push(strArray.join(" ").padEnd(maxWidth, " "))

    return finalRes
}

const processArr = (wordsArr, maxWidth) => {
    if (wordsArr.length == 1) {
        return wordsArr.join(" ").padEnd(maxWidth, " ")
    }

    let totalChars = wordsArr.reduce((sum, word) => sum + word.length, 0)
    let totalSpaces = maxWidth - totalChars
    let spaceSlots = wordsArr.length - 1
    let spaceBetween = Math.floor(totalSpaces / spaceSlots)
    let extraSpaces = totalSpaces % spaceSlots

    let result = ""
    for (let i = 0; i < wordsArr.length - 1; i++) {
        result += wordsArr[i] + " ".repeat(spaceBetween + (i < extraSpaces ? 1 : 0))
    }
    result += wordsArr[wordsArr.length - 1]

    return result
}