@gouch/to-title-case
Version:
A JavaScript method for intelligently converting strings to title case
45 lines (39 loc) • 1.43 kB
JavaScript
/* To Title Case © 2018 David Gouch | https://github.com/gouch/to-title-case */
// eslint-disable-next-line no-extend-native
String.prototype.toTitleCase = function () {
'use strict'
var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|v.?|vs.?|via)$/i
var alphanumericPattern = /([A-Za-z0-9\u00C0-\u00FF])/
var wordSeparators = /([ :–—-])/
return this.split(wordSeparators)
.map(function (current, index, array) {
if (
/* Check for small words */
current.search(smallWords) > -1 &&
/* Skip first and last word */
index !== 0 &&
index !== array.length - 1 &&
/* Ignore title end and subtitle start */
array[index - 3] !== ':' &&
array[index + 1] !== ':' &&
/* Ignore small words that start a hyphenated phrase */
(array[index + 1] !== '-' ||
(array[index - 1] === '-' && array[index + 1] === '-'))
) {
return current.toLowerCase()
}
/* Ignore intentional capitalization */
if (current.substr(1).search(/[A-Z]|\../) > -1) {
return current
}
/* Ignore URLs */
if (array[index + 1] === ':' && array[index + 2] !== '') {
return current
}
/* Capitalize the first letter */
return current.replace(alphanumericPattern, function (match) {
return match.toUpperCase()
})
})
.join('')
}