http://games.usvsth3m.com/javascript-under-pressure/ - my solutions

javascript-under-pressure.js

function doubleInteger(i) {
    
    // i will be an integer. Double it and return it.
    return i * 2;
}

function isNumberEven(i) {
    
    // i will be an integer. Return true if it's even, and false if it isn't.
    
    return i%2 == 0;
}
function getFileExtension(i) {
    
    // i will be a string, but it may not have a file extension.
    // return the file extension (with no period) if it has one, otherwise false
    
    if (i.indexOf('.') === -1) {
        return false;
    }
    
    return i.split('.').pop();
}


function longestString(i) {
    
    // i will be an array.
    // return the longest string in the array
    return i.reduce(function(prev, curr) {
        var isPrevString = (typeof prev == 'string');
        var isCurrString = (typeof curr == 'string');
        
        if (!isPrevString || !isCurrString) {
            if (!isPrevString && !isCurrString) {
                return '';
            } else {
                return isPrevString? prev: curr;
            }
        }
        
        return (prev.length > curr.length) ? prev : curr;
    });
}

function arraySum(i) {
	
	// i will be an array, containing integers, strings and/or arrays like itself.
      // Sum all the integers you find, anywhere in the nest of arrays.
	
	switch (typeof i) {
		case 'object':
			return i.reduce(function(prev, curr){
				return prev + arraySum(curr);
			}, 0);
		case 'number':
			return i;
		default:
			return 0;
	}

}

daf da dfa