I have an object called data some of the elements are undefined, or simply missing.
How can I do a for loop to assign my personal value to these fields?
data.forEach(function(obj) {
for(var i in obj) {
if(obj[i] === undefined) {
obj[i] = '';
}
}
});
This is currently only replacing the undefined, how can I update to pass an empty value for any field if it doesn't exist?
You can create an array with all your keys:
var keys = ['foo', 'bar', 'buzz'];
then iterate over it and check for that is key-given property exists in your object
var obj = {
foo: 'a'
}
for (var i = 0, n = keys.length; i < n; i++) {
var key = keys[i];
if (!obj[key]) {
obj[key] = '';
}
}
Cheers
If you want to complete the "gaps", in the sense that some of your objects will not have properties that others do have, then you can use this ES6 code:
function fillGaps(data) {
return new Set([].concat(...data.map(Object.keys))) // create set of all keys
.forEach( key =>
data.filter( obj => obj[key] === undefined) // get missing/undefined keys
.forEach( obj => obj[key] = '' ) ); // set them
}
// Example
var data = [{
a: 1,
b: 2
}, {
a: 10,
b: 30,
c: 9
}, {
a: undefined,
c: 8
}];
fillGaps(data);
console.log(data);.as-console-wrapper { max-height: 100% !important; top: 0; }function fillGaps(data) {
// create object with all keys
keys = Object.keys([].concat.apply([], data.map(Object.keys))
.reduce (function (acc, key) {
acc[key] = 1;
return acc;
}, {})
).forEach(function (key) {
return data.filter(function (obj) { // get missing/undefined keys
return obj[key] === undefined;
}).forEach(function (obj) { // set them
obj[key] = '';
});
});
}
// Example
var data = [{
a: 1,
b: 2
}, {
a: 10,
b: 30,
c: 9
}, {
a: undefined,
c: 8
}];
fillGaps(data);
console.log(data);.as-console-wrapper { max-height: 100% !important; top: 0; }
new Set( .... ) or put the function in your code, and call it from within your current function. Even if you place my function inside your function, and then call it, it should work.