71. 写一个方法把下划线命名转成大驼峰命名

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题目来源 https://github.com/haizlin/fe-interview/issues/12

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function transformCamelCase(name) {
    return name.split('_').map((n, index) => index > 0 ? n.substr(0,1).toUpperCase() + n.substr(1) : n).join('')
}

//测试
transformCamelCase('a_c_def')     //aCDef
transformCamelCase('a_bcd_efg') //a_bcd_efg