object object javascript
person = {
'name':'john smith'
'age':41
};
console.log(person);
//this will return [object Object]
//use
console.log(JSON.stringify(person));
//insteadobject object javascript
person = {
'name':'john smith'
'age':41
};
console.log(person);
//this will return [object Object]
//use
console.log(JSON.stringify(person));
//insteadobject methods in javascript
/// OBJECTS IN JAVASCRIPT
const testScore = {
damon: 89,
shawn: 91,
keenan: 80,
kim: 89,
};
Object.keys(testScore); // gives all keys
Object.values(testScore); // gives all values
Object.entries(testScore); // gives nested arrays of key-value pairs
// YOU CAN USE ( FOR-IN ) LOOP FOR ITERATION OVER OBJECTS
for (let person in testScore) {...}
// WE CAN'T DIRECTLY USE ( FOR-OF ) LOOP IN OBJECTS BUT WE CAN DO Like THIS:
for(let score of Object.values(testScore)){
console.log(score) // 89 91 80 89
}define methods of objects in javascript
objectName.methodname = functionName;
var myObj = {
myMethod: function(params) {
// ...do something
}
// OR THIS WORKS TOO
myOtherMethod(params) {
// ...do something else
}
};js object methods
// create 2 objects for Mark and John that calculate their BMI's
// BMI = mass / height ** 2 || mass / (height * height);
// mass: kg
// john object
const johnObj = {
firstName: "John",
lastName: "Smith",
mass: 92,
height: 1.95,
calcBMI: function () {
// learn more about 'this'
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this
this.bmi = Number((this.mass / this.height ** 2).toFixed(2));
return this.bmi;
},
};
// mark object
const markObj = {
firstName: "Mark",
lastName: "Miller",
mass: 78,
height: 1.69,
calcBMI: function () {
this.bmi = Number((this.mass / this.height ** 2).toFixed(2));
return this.bmi;
},
};
// store the ternary results in a variable
const results =
johnObj.calcBMI() > markObj.calcBMI()
? `${johnObj.firstName} has a higher BMI of ${johnObj.calcBMI()} than ${
markObj.firstName
}'s BMI of ${markObj.calcBMI()}!`
: `${markObj.firstName} has a higher BMI of ${markObj.calcBMI()} than ${
johnObj.firstName
}'s BMI of ${johnObj.calcBMI()}!`;
// display the results on the console
console.log(results);Copyright © 2021 Codeinu
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