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JavaScript JavaScript Arrays Loop Through Arrays Array Methods

Posted by Frank Grillo
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Frank Grillo
Front End Web Development Techdegree Graduate 16,715 Points

How to write an Array Method with Join

Is this how you write an Array method with Join?

script.js 
const planets = ['Earth','Mars','Saturn','Mercury','Jupiter','Venus','Uranus','Neptune'];
planets.join(', ');
console.log();

1 Answer

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,722 Points
Jeff Muday
Jeff Muday
Treehouse Moderator 28,722 Points

Yes, you are correct. Thejoin method of the list does return a string that is a joining or concatenation of the list. However, your console.log() is blank, although you may have meant it to be like that.

You may want to capture the output of the join into another variable and log the output.

const planets = ['Earth','Mars','Saturn','Mercury','Jupiter','Venus','Uranus','Neptune'];

// the method of 'join' being captured into a variable
const planetsString = planets.join(', ');

// the original
console.log(planets);

// the joined string
console.log(planetsString);