3.实现Buffer.concat方法 about 201603node

[hehedaidai]

//作业 是写一个zfconcat 方法跟上面的合并一样

Buffer.zfconcat = function(sp1,sp2,num){

    var total = sp1.length +sp2.length;
    var newBuffer = new Buffer(num);
    var array = [];
    for(var i=0;i<sp1.length;i++){

        array.push(sp1[i]);

    }

    for(var j=i;j<newBuffer.length;i++){
        array.push(sp1[j]);
    }
    newBuffer.fill(array);
    return newBuffer;
}

console.log("自定义"+Buffer.zfconcat(sp1,sp2,6).toString('utf8'))

[lizhongwu]

Buffer.zfconcat = function (ary ,length) {
    if (!length) {
        length=0;
        ary.forEach(function(i) {
            i.forEach(function(j) {
                length++;
            })
        });
    }
    var result = new Buffer(length);
    var k=0;
    ary.forEach(function(i) {
        i.forEach(function(j) {
            result.fill(j , k, k+1);
            k++;
        })
    });
    return new Buffer(result);
};