In JS;
Trying to write a function that takes in an array of objects and a series of arguments. The function will remove any properties not given as arguments.
example: input cleanseData([{a: 'b', c:'d'}, {a: 'q'}], 'a');
output [{a: 'b'}, {a: 'q'}]
Here is the function that tried but the objects remain unchanged.
var cleanseData = function(listObj, key1, key2, key3) {
for (var i=0; i<listObj.length; i++) {
for(k in listObj[i]) {
if(k !== key1 && k!==key2 && k!==key3) {
delete listObj[i].k;
}
}
}
return listObj;
}
In this line...
delete listObj[i].k;
It's trying to delete a property k
, which doesn't exist. Change to...
delete listObj[i][k];
var cleanseData = function (listObj,key) {
for (var i = 0;i < listObj.length; i++) {
for(var k in listObj[i])
if (k!=key) {
delete listObj[i][k];
}
}
return listObj;
}
console.log(JSON.stringify(cleanseData([{a: 'b', c:'d'}, {a: 'q'}], 'a')));
As a matter of style, you could do something like this
function cleanse(arr, proplist) {
return arr.map(function(elem) {
var props = Object.keys(elem);
var props_to_remove = props.filter(function(p) {
return proplist.indexOf(p) === -1;
});
props_to_remove.forEach(function(p) {
delete elem[p];
})
return elem;
});
}
Note that this returns a new array which satisfies your condition and does not modify the old array you passed in.
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