zero padding test

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check value
let n = 0, ipad = '';
for (let i = 0; i < 10000; i++) {
	n = i % 10 < 5 ? i % 10 : i % 100;
    ipad = n < 10 ? '0' + n : n.toString();
}
ready
slice string
let n = 0, ipad = '';
for (let i = 0; i < 10000; i++) {
	n = i % 10 < 5 ? i % 10 : i % 100;
	ipad = ('0' + n).slice(-2)
}
ready
pad start
let n = 0, ipad = '';
for (let i = 0; i < 10000; i++) {
	n = i % 10 < 5 ? i % 10 : i % 100;
	ipad = n.toString().padStart('0', 2);
}
ready

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