I have an object with inconsistent nesting structure that I have no control over. I need to extract certain value if it met a certain condition.
currently doing it by iterating over the properties recursively and matching the properties with the condition and pushing the matched values to an empty array like this:
var obj = {"a":0,"b":{"x":1,"y":100},"c":[{"x":1,"y":120},{"x":2,"y":140}]};
var extracts = [];
extractProp(obj);
function extractProp(obj){
for (var key in obj){
if (key == "x" && obj[key]=="1"){
extracts.push(obj["y"]);
} else {
extractProp(obj[key]);
}
}
}
console.log(extracts); //(2) [100, 120]
which allows me to get the expected result. In my previous question , someone pointed out a better way in modifying parts of json by passing reviver parameter on JSON.parse. It got me thinking that there must be a better way to do this too. Are there any native / built-in function in javascript for this?
Not quite much better but faster
Check comparision here http://jsben.ch/7OZfP
let obj = { "a": 0, "b": { "x": 1, "y": 100 }, "c": [{ "x": 1, "y": 120 }, { "x": 2, "y": 140 }] }; var extracts = []; extractProp(obj); function extractProp() { Object.entries(obj).forEach(([key, val]) => { if (typeof val === 'object') { if (Array.isArray(val)) { val.forEach(gety) } else { gety(val) } } }); } function gety({ x, y }) { if (x == 1 && y) extracts.push(y); } console.log(extracts); //(2) [100, 120]
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