I am a javascript newbie. I have to create a var pets with an array ['cat', 'dog', 'rat'] and by using for loop I have make each strings in that array plural.
My code is:
var pets = ['cat', 'dog', 'rat'];
for (pets[i] = pets[i] + 's';) {
};
console.log(pets);
Error is:
for (pets[i] = pets[i] + 's';) {
^
Could not run: Unexpected token )
The syntax of the for loop is incorrect. It'll throw Syntax Errors.
The Correct syntax is:
for ([initialization]; [condition]; [final-expression])
statement
Updated Code:
for(var i = 0; i < pets.length; i++) {
pets[i] = pets[i] + 's';
}
You can even write this in single line, taking advantage of the last expression of the for which is evaluated after each iteration.
for(var i = 0; i < pets.length; pets[i] = pets[i] + 's', i++);
Note: Multiple expression are separated by using ,-comma operator.
for(var i = 0; i < pets.length; pets[i] = pets[i] + 's',i++); shortened little bit.Your for loop is messed up, it can surely be done using for-loop but I would suggest you to use Array.prototype.map()
var pets = ['cat', 'dog', 'rat'];
pets = pets.map(function(el){
return el+"s";
});
The map() method creates a new array with the results of calling a provided function on every element in this array.
In ECMAScript2015 arrow function
var pets = ['cat', 'dog', 'rat'];
pets = pets.map( el => el+"s");
If you still feel like using for loop and want to write some unnecessary code then do:
for(var i = 0; i < pets.length; i++){
pets[i] = pets[i] + 's';
}
pets.map(el => el + 's');
for (pets[i] = pets[i] + 's';)huh? see MDN for doc