Studying all day long)
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'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var toString = require('../internals/to-string');
var charAt = uncurryThis(''.charAt);
var charCodeAt = uncurryThis(''.charCodeAt);
var exec = uncurryThis(/./.exec);
var numberToString = uncurryThis(1.0.toString);
var toUpperCase = uncurryThis(''.toUpperCase);
var raw = /[\w*+\-./@]/;
var hex = function (code, length) {
var result = numberToString(code, 16);
while (result.length < length) result = '0' + result;
return result;
};
// `escape` method
// https://tc39.es/ecma262/#sec-escape-string
$({ global: true }, {
escape: function escape(string) {
var str = toString(string);
var result = '';
var length = str.length;
var index = 0;
var chr, code;
while (index < length) {
chr = charAt(str, index++);
if (exec(raw, chr)) {
result += chr;
} else {
code = charCodeAt(chr, 0);
if (code < 256) {
result += '%' + hex(code, 2);
} else {
result += '%u' + toUpperCase(hex(code, 4));
}
}
} return result;
}
});