I hope someone can answer this for me. Is there a way in JavaScript that we can use a loop with an "if" statement inside and only return true if all the values in the loop iterations meet that condition. Thank you

I hope someone can answer this for me. Is there a way in JavaScript that we can use a loop with an "if" statement inside and only return true if all the values in the loop iterations meet that condition. Thank you

• javascript
• for-loop
• if-statement
• boolean

• for (…) { if (!condition) return false; } return true – Bergi Commented Dec 14, 2019 at 15:23

2 Answers 2

Yes there is. For example the .every method of an Array does this exact thing.
Quoted from MDN:

The every() method tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

const ages = [24, 32, 22, 21, 29];
const legalDrinkingAge = 21;
const areLegalDrinkingAges = ages.every(age => age >= legalDrinkingAge);

console.log(areLegalDrinkingAges);

You can define a var, e.g. result holding the value true, then executing the for loop and checking the condition using the if statement. Once condition fails, set result to false and break out of the for loop.

At the end, result will be true if the if statement was true for all elements checked and false otherwise.

var result = true;
var a = [12,14,16,18,5,11,12];   // array with example values
for (var i = 0; i < a.length; i ++) {
    if (!(a[i] >= 10)) {  // the condition
        result = false;
        break;
    }
}
console.log(result); // false