javascript foreach get key and value
myObject ={a:1,b:2,c:3}
//es6
Object.entries(myObject).forEach(([key, value]) => {
console.log(key , value); // key ,value
});
//es7
Object.keys(myObject).forEach(key => {
console.log(key , myObject[key]) // key , value
})javascript loop through object
Object.entries(obj).forEach(
([key, value]) => console.log(key, value)
);
// Loop using forEach
arr.forEach((item, index) => {
// TODO
})
// Loop using for...of
for (const item of arr) {
await something()
}
// Clone new array (not changing the old one)
const arr = [1,2,3]
const newArray = arr.map(item => item * 2)
console.log(newArray)
// Filter array by condition
const arr = [1,2,3,1]
const newArray = arr.filter(item => {
if (item === 1) { return item }
})
console.log(newArray)
// Join array
const arr1 = [1,2,3]
const arr2 = [4,5,6]
const arr3 = [...arr1, ...arr2]
console.log(arr3)
// Get a property of object
const { email, address } = user
console.log(email, address)
// Copy object/array
const obj = { name: 'my name' }
const clone = { ...obj }
console.log(obj === clone)object.keys javascript
const object1 = {
a: 'somestring',
b: 42,
c: false
};
console.log(Object.keys(object1));Copyright © 2021 Codeinu
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