Tell us what’s happening:
Hey guys, I’ve complete the challenge, but I’d like to understand better the logic behind.
Spoiler here:
1:
- a. You call the function with name and prop arguments
- b. The for loop iterate through the contacts array (i < contacts.length)
- c. The if statement checking if the passing arguments are match with the number contacts[i] Array
- d. if they match so function return the prop value, if not it returns the else strings
2:
-
If the first if statement is true > go and check the nested if statement > if the nested if statement is true > return prop value > otherwise > return the else statement
-
The nested if statement replace the need of the && (and) operator
3:
How the loop works in this challenge:
- When the loop start running > the loop check if his first number (var i = 0) match with the first if statement condition contacts[i] and name parameter > if not > jumping back from the if statement to the loop, and continue like this until the loop number match with the if statement > otherwise executing the else statement.
Got it right?
And spoiler here:
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["JavaScript", "Gaming", "Foxes"]
}
];
function lookUpProfile(name, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++) {
if (contacts[i].firstName === name) {
if (contacts[i].hasOwnProperty(prop)) {
return contacts[i][prop];
} else {
return "No such property";
}
}
}
return "No such contact";
// Only change code above this line
}
// Change these values to test your function
console.log(lookUpProfile("Harry", "likes"));
I could use also else if statement, but it would make the code longer and less cleaner.
Link to the challenge:
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/profile-lookup