es.string.from-code-point.js
No OneTemporary
Actions

Size

1 KB

Subscribers

None

es.string.from-code-point.js
View Options

	var $ = require('../internals/export');
	var uncurryThis = require('../internals/function-uncurry-this');
	var toAbsoluteIndex = require('../internals/to-absolute-index');

	var $RangeError = RangeError;
	var fromCharCode = String.fromCharCode;
	// eslint-disable-next-line es-x/no-string-fromcodepoint -- required for testing
	var $fromCodePoint = String.fromCodePoint;
	var join = uncurryThis([].join);

	// length should be 1, old FF problem
	var INCORRECT_LENGTH = !!$fromCodePoint && $fromCodePoint.length != 1;

	// `String.fromCodePoint` method
	// https://tc39.es/ecma262/#sec-string.fromcodepoint
	$({ target: 'String', stat: true, arity: 1, forced: INCORRECT_LENGTH }, {
	// eslint-disable-next-line no-unused-vars -- required for `.length`
	fromCodePoint: function fromCodePoint(x) {
	var elements = [];
	var length = arguments.length;
	var i = 0;
	var code;
	while (length > i) {
	code = +arguments[i++];
	if (toAbsoluteIndex(code, 0x10FFFF) !== code) throw $RangeError(code + ' is not a valid code point');
	elements[i] = code < 0x10000
	? fromCharCode(code)
	: fromCharCode(((code -= 0x10000) >> 10) + 0xD800, code % 0x400 + 0xDC00);
	} return join(elements, '');
	}
	});