js分割字符串，先四位再六位再四位

Question

这种格式的

Answer 1

准备数据

const cases = [
    "GOAC720202EDB",
    "GOAC720202MCSMGN06",
    "GOAC720202MCSMGN062343456"
];

const segmentLengths = [4, 6, 4, 4];

方法一

cases.forEach(s => {
    const result = [...segmentLengths, Infinity]
        .reduce(([start, r], length) => {
            r.push(s.slice(start, start + length));
            return [start + length, r];
        }, [0, []])[1]
        .filter(it => it)
        .join(" ");
    console.log(`|${result}|`);
});

方法二

function* seperateBySpace(s, segmentLengths) {
    let begin = 0;
    for (const len of segmentLengths) {
        yield s.slice(begin, begin + len);
        begin += len;
        if (begin > s.length) {
            return;
        }
    }
    if (begin < s.length - 1) {
        yield s.slice(begin);
    }
}

const segmentLengths = [4, 6, 4, 4];
cases.forEach(s => {
    const result = [...seperateBySpace(s, segmentLengths)].join(" ");
    console.log(`|${result}|`);
});

输出都是

|GOAC 720202 EDB|
|GOAC 720202 MCSM GN06|
|GOAC 720202 MCSM GN06 2343456|

Answer 2

substr这个