JSFiddle - React, Tailwind, and code Playground

JavaScript

var allNumbers = [1, 2, 4, 5, 6, 7, '8'],
someNumbers = [1, 2, 'привет', 4, 5, 6, 7],
noNumbers = ['это', 'массив', 'без', 'чисел'];

function isNumber(val) {
		return typeof val === 'number';
	}

function isAllTrue(source, fileFn){
	var result;

	for(var i = 0; i < source.length; i++){

		if(fileFn(source[i]) === true){
				return true

		}

		else if(fileFn(source[i]) !== true){
			return false
		} 
	}	
	return result;
}
isAllTrue(allNumbers, isNumber)