how to generate numeric key of an array in JavaScript?

Question

Here are my codes:

var overallBlockList = Array();
    var blockListArray = Array();

$.each(data.blockList, function( key, value ) {
             blockListArray['blockNumber'] = value.blockNumber;
             blockListArray['age'] = value.age;
             blockListArray['txn'] = value.txn;
             blockListArray['uncles'] = value.uncles;
             blockListArray['miner'] = value.miner;
             blockListArray['gasUsed'] = value.gasUsed;
             blockListArray['gasLimit'] = value.gasLimit;
             blockListArray['avg.GasPrice'] = value['avg.GasPrice']['value'] + " " + value['avg.GasPrice']['unit'];
             blockListArray['reward'] = value['reward']['value'] + " " +value['reward']['unit'];

             overallBlockList[] = blockListArray; // In php, the overallBlockList Key will auto generate numeric. how about in Js syntax?
        });

I wish to get the below one. the overallBlockList will have the numeric key with blockListArray data. But the overallBlockList[] = blockListArray; is php syntax. how about for javascript syntax in order to generate numeric key of overallBlockList?

[overallBlockList] => Array
                (
                    [0] => Array
                        (
                            [blockNumber] => 6764218
                            [age] => 1573608431
                            [txn] => 30
                            [uncles] => 0
                            [miner] => 0x4ccfb3039b78d3938588157564c9ad559bafab94
                            [gasUsed] => 3347881
                            [gasLimit] => 8000000
                            [avg.GasPrice] => 993239
                            [reward] => 39209320

                        )

                    [1] => Array
                        (
                            [blockNumber] => 6764217
                            [age] => 1573608410
                            [txn] => 54
                            [uncles] => 0
                            [miner] => 0x4ccfb3039b78d3938588157564c9ad559bafab94
                            [gasUsed] => 2300623
                            [gasLimit] => 8000000
                            [avg.GasPrice] => 329329
                            [reward] => 382938

                        )

What exactly do you mean by 'overallBlockList will have the numeric key with blockListArray data'. Like are you looking for an array overallBlockList of blockListArray objects? Or are you look for an object structured like: {key: blockListArrayData} — Viktor Garba
– Viktor Garba, Commented Nov 13, 2019 at 4:04

codeandcloud · Accepted Answer · 2019-11-13 04:31:46Z

arrays have indices and objects have properties. Here, what you want is an array of objects.

This is how the code would look like

var overallBlockList = [];

$.each(data.blockList, function(key, value) {
    var blockList = { };
    blockList['blockNumber'] = value.blockNumber;
    blockList['age'] = value.age;
    blockList['txn'] = value.txn;
    blockList['uncles'] = value.uncles;
    blockList['miner'] = value.miner;
    blockList['gasUsed'] = value.gasUsed;
    blockList['gasLimit'] = value.gasLimit;
    blockList['avg.GasPrice'] = value['avg.GasPrice']['value'] + " " + value['avg.GasPrice']['unit'];
    blockList['reward'] = value['reward']['value'] + " " + value['reward']['unit'];

    overallBlockList.push(blockList);
});

The overallBlockList array will be,

[
    {
        "blockNumber": 6764218,
        "age": 1573608431,
        "txn": 30,
        "uncles": 0,
        "miner": "0x4ccfb3039b78d3938588157564c9ad559bafab94",
        "gasUsed": 3347881,
        "gasLimit": 8000000,
        "avg.GasPrice": "993239 unit",
        "reward": "39209320 unit"
    },
    {
        "blockNumber": 6764217,
        "age": 1573608410,
        "txn": 54,
        "uncles": 0,
        "miner": "0x4ccfb3039b78d3938588157564c9ad559bafab94",
        "gasUsed": 2300623,
        "gasLimit": 8000000,
        "avg.GasPrice": "329329 unit",
        "reward": "382938 unit"
    }
]

Code can be simplified as,

var overallBlockList = [];

$.each(data.blockList, function(key, value) {
    overallBlockList.push({
        blockNumber: value.blockNumber,
        age: value.age,
        // ...
        'avg.GasPrice': value['avg.GasPrice'].value + " " + value['avg.GasPrice'].unit,
        reward: value.reward.value + " " + value.reward.unit
    });
});

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