[Solved-6 Solutions] Iterate through object properties - javascript tutorial
Problem:
How does iterate through an object properties ?
Solution 1:
Iterator method convert to a standard JS object into an iterable object.
var o = {a:1,b:2,c:3},
a = [];
o[Symbol.iterator] = function*(){
var ok = Object.keys(this);
i = 0;
while (i < ok.length) yield this[ok[i++]];
};
for (var value of o) console.log(value);
// or you can even do like
a = [...o];
console.log(a);Solution 2:
Using jQuery.
$.each( obj, function( key, value ) {
alert( key + ": " + value );
});Solution 3:
To requires additional property as hasownproperty
for (var property in object) {
if (object.hasOwnProperty(property)) {
// do stuff
}
}
Object's prototype contains additional properties for the object which are technically part of the object. These additional properties are inherited from the base object class, they are properties of object.
Solution 4:
We can use Object.keys(obj) to get an Array of properties defined on the object itself.
Object.keys(obj).forEach(function(key,index) {
// key: the name of the object key
// index: the ordinal position of the key within the object
});
It is more readable than a for-in loop. It is supports for firefox, chrome and internet explorer.
Read Also
Checking if a key exists in a JavascriptSolution 5:
Using ECMAScript.
Object.keys(obj).forEach(e => console.log(`key=${e} value=${obj[e]}`));Solution 6:
We can use Object.entries:
for (const [key, value] of Object.entries(obj)) { }or
Object.entries(obj).forEach(([key, value]) => ...)We want to iterate over the values, then use Object.values:
for (const value of Object.values(obj)) { }or
Object.values(obj).forEach(value => ...)