全角数字半角数字変換

Benchmark created on

Description

convert ０-９ (U+FF10 - U+FF19) to 0-9 (U+0030 - U+0039).

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Testing in
TestOps/sec
String.prototype.replace with regex and charCode
function replaceToHalfWidthDigits(str) {
	return str.replace(/[０-９]/g, (char) => String.fromCharCode(char.charCodeAt(0) - 0xfee0));
}

for (let i = 0; i < 1000; i++) {
	const value = '０１２３４５６７８９';
	const result = replaceToHalfWidthDigits(value);
	if (result !== '0123456789') {
		console.log('FAIL');
		exit(1);
	}
}
ready
String.prototype.replaceAll with regex and charCode
function replaceToHalfWidthDigits(str) {
	return str.replaceAll(/[０-９]/g, (char) => String.fromCharCode(char.charCodeAt(0) - 0xfee0));
}

for (let i = 0; i < 1000; i++) {
	const value = '０１２３４５６７８９';
	const result = replaceToHalfWidthDigits(value);
	if (result !== '0123456789') {
		console.log('FAIL');
		exit(1);
	}
}
ready
replace in loop
function replaceToHalfWidthDigits(str) {
	let str2 = '';
	for(const c of str) {
		switch (c) {
			case '０': str2 += '0'; break;
			case '１': str2 += '1'; break;
			case '２': str2 += '2'; break;
			case '３': str2 += '3'; break;
			case '４': str2 += '4'; break;
			case '５': str2 += '5'; break;
			case '６': str2 += '6'; break;
			case '７': str2 += '7'; break;
			case '８': str2 += '8'; break;
			case '９': str2 += '9'; break;
			default: str2 += c;
		}
	}
	return str2;
}

for (let i = 0; i < 1000; i++) {
	const value = '０１２３４５６７８９';
	const result = replaceToHalfWidthDigits(value);
	if (result !== '0123456789') {
		console.log('FAIL');
		exit(1);
	}
}
ready

Revisions

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