下划线 - 在数组中搜索匹配的路径

Question

下面是我正在处理的简化逻辑，我想在数组中找到匹配位置（文件夹）的文件。

我能够使用vanilla JS循环来实现这一点，你能建议更好/更简单/下划线的方式来实现这样的功能吗？

// source
var arr = [
    "file:/anotherName/image1.jpg",
    "file:/anotherName/image2.jpg",
    "file:/anotherName/image3.jpg",
    "file:/folderName/image4.jpg",
    "file:/folderName/image1.jpg",
    "file:/folderName/image2.jpg",
    "file:/folderName/image3.jpg",
    "file:/folderName/image4.jpg"
];

// array to store matches
var tmp = [];
for (var i = 0; i < arr.length; i++) {
    if( arr[i].indexOf('file:/folderName/') !== -1) tmp.push(arr[i]);
};

console.log(tmp); 
// [ 'file:/folderName/image4.jpg',
// 'file:/folderName/image1.jpg',
// 'file:/folderName/image2.jpg',
// 'file:/folderName/image3.jpg',
// 'file:/folderName/image4.jpg' ]

Answer 1

您可以使用过滤器。我还会使用正则表达式匹配

http://jsfiddle.net/x5j3600z/

var arr = [ 
    "file:/anotherName/image1.jpg",
    "file:/anotherName/image2.jpg",
    "file:/anotherName/image3.jpg",
    "file:/folderName/image4.jpg",
    "file:/folderName/image1.jpg",
    "file:/folderName/image2.jpg",
    "file:/folderName/image3.jpg",
    "file:/folderName/image4.jpg"
];

var tmp = _.filter(arr, function (el) {
    return el.match(/file:\/folderName/);
});

console.log(tmp);