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28 lines
577 B
28 lines
577 B
4 years ago
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var upperCase = require('upper-case')
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var lowerCase = require('lower-case')
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/**
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* Swap the case of a string. Manually iterate over every character and check
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* instead of replacing certain characters for better unicode support.
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*
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* @param {String} str
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* @param {String} [locale]
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* @return {String}
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*/
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module.exports = function (str, locale) {
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if (str == null) {
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return ''
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}
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var result = ''
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for (var i = 0; i < str.length; i++) {
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var c = str[i]
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var u = upperCase(c, locale)
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result += u === c ? lowerCase(c, locale) : u
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}
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return result
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}
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