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kaiguogit/normalize.js

Created September 1, 2016 23:45
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  1. kaiguogit created this gist Sep 1, 2016.
    87 changes: 87 additions & 0 deletions normalize.js
    View file
    Original file line number Diff line number Diff line change
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    var response={
    authors:[
    {
    id: 1,
    name: "Monica",
    posts: [
    {
    id: 1,
    title: "how to write fast js",
    comments:[
    {id:1,
    text: "fast js is really fast"
    },
    {id:2,
    text: "fast js is not bad"
    }
    ]
    },
    {
    id: 2,
    title: "how to write slow js",
    comments:[
    {
    id:3,
    text: "it is too slow"
    }
    ]
    }
    ]
    },
    {
    id: 2,
    name: "John",
    posts: [
    {
    id: 2,
    title: "how to write slow js",
    comments:[
    {
    id:3,
    text: "it is too slow"
    }
    ]
    }
    ]
    }
    ]
    }


    function normalize(parent, object){
    var keys = Object.keys(object);

    //iterate through keys
    keys.forEach(function(key){

    //if value is array, create a array in result variable
    if(Array.isArray(object[key])){
    if(!result[key]) result[key] = [];

    // add each item to the
    object[key].forEach(function(child, i){

    if(!result[key].find(function(item){return item.id === child.id})){
    if(parent) child[parent+"_id"] = object.id;
    result[key].push(child);
    }

    // **** recursion ****//
    normalize(singular(key), child);
    });
    delete object[key];
    }
    });
    }

    function singular(str){
    return str.replace(/[s]$/i, "");
    }

    var result = {};
    normalize("", response);
    console.log(result);