I have an array of JavaScript objects:
var obj = [{key1: Value1, key2: VALUE2},{key1: Value1, key2: VALUE2}];
I want the value of the key2 to be in lowercase, like this:
var obj = [{key1: Value1, key2: value2},{key1: Value1, key2: value2}];
How can I change the value from lowercase to uppercase?
If I understand your question correctly, you want to change the value of each object's key2 property, to be a lowercase string (I'm assuming they're strings).
You can do this with a simple map.
obj = obj.map(function(a) {
a.key2 = a.key2.toLowerCase();
return a;
});
There are some differences in all the answers given here, surrounding object references. In my answer above, the array itself will be a new reference, but the objects inside will remain as the same reference. To clarify this by way of example
var mapped = obj.map(function(a) {
a.key2 = a.key2.toLowerCase();
return a;
});
console.log(obj === mapped) // false
console.log(obj[0] === mapped[0]) // true
If you're using a for loop or a forEach array function, then the array reference will remain the same.
See this fiddle for reference.
for forEach and assign
Object.assign the first argument will be the reference that is returned. So if you pass item to it, the reference will not change. Only if you call Object.assign({}, item, { key2: item.key2.toLowerCase() }), a new object will be created.caseInsensitivity = function(obj) {
Object.keys(obj).forEach(k => {
if(typeof obj[k] == 'string') {
obj[k] = obj[k].toLowerCase();
}
else if(typeof obj[k] == 'object') {
caseInsensitivity(obj[k]);
}
else {
}
});
return obj;
}
To convert all values even if the values are nested objects or arrays.
You can use built-in array functions like forEach or map
// in-place
obj.forEach(function (item) {
item.key2 = item.key2.toLowerCase()
})
or
var mapped = obj.map(function (item) {
return Object.assign(item, { key2: item.key2.toLowerCase() });
})
You just have to loop through the array and lowercase the value of key2 for every object.
var objects = [{key1: "Value1", key2: "VALUE2"},{key1: "Value1", key2: "VALUE2"}];
for(var i = 0;i < objects.length;++i) {
objects[i].key2 = objects[i].key2.toLowerCase();
}
You could iterate the array and the keys, you want to change, and assign the lowercase value if you have a string.
var array = [{ key1: 'Value1', key2: 'value2' }, { key1: 'Value1', key2: 'value2' }];
array.forEach(function (a) {
['key2'].forEach(function (k) {
if (typeof a[k] === 'string') {
a[k] = a[k].toLowerCase();
}
});
});
console.log(array);A version with a fixed key.
var array = [{ key1: 'Value1', key2: 'value2' }, { key1: 'Value1', key2: 'value2' }];
array.forEach(function (a) {
if (typeof a.key2 === 'string') {
a.key2 = a.key2.toLowerCase();
}
});
console.log(array);
key2Concept:
Create a function to lowercase an item based on the given key. Then, iterate items and parse each item on those function.
Create a function to lowercase the item based on the given key:
function lowerObj(obj, key) { obj['' + key] = obj['' + key].toLowerCase(); return obj; }
Iterate items and parse each item on those function
var newObj = obj.map((item) => {return lowerObj(obj, 'your_key')});
So, you will get newObj with lower case for the item with the given key.
Example
function lowerObj(obj, key) {
obj['' + key] = obj['' + key].toLowerCase();
return obj;
}
var obj = [{key1: 'Value01', key2: 'Value02'}, {key1: 'Value11', key2: 'Value12'}];
var newObj = obj.map((item) => {return lowerObj(item, 'key2')});
console.log(JSON.stringify(newObj, null, 3));
'' +" part in your answer? (But without "Edit:", "Update:", or similar - the answer should appear as if it was written today.)Assuming you had a JSON object like.
"params": {
"name": "LOWERNAME"
"phone": "1234567899"
}
Call your object like:
let user = {
name: params.name.toLowerCase(),
phone: params.phone
}
You could modify it to suit your situation!
.toLowercase()