Solving the puzzle in javascript [on hold]
- by Gandalf StormCrow
I've recently try to brush up my javascript skills, so I have a friend who gives me puzzles from time to time to solve. Yesterday I got this :
function testFun() {
f = {};
for( var i=0 ; i<3 : i++ ) {
f[i] = function() { alert("sum='+i+f.length); }
}
return f;
}
Expected Results:
testFun()[0]() should alert “sum=0”
testFun()[1]() should alert “sum=2”
testFun()[2]() should alert “sum=4”
I did this which does like requested above:
function testFun() {
var i,
f = {};
for (i = 0; i < 3; i++) {
f[i] = (function(number) {
return function() {
alert("sum=" + (number * 2));
}
}(i));
}
return f;
}
Today I got new puzzle :
Name everything wrong with this javascript code, then tell how you would re-write it.
function testFun(fInput) {
f = fInput || {};
// append three functions
for( var i=0 ; i<3 : i++ ) {
f[i] = function() { alert("sum='+i+f.length); }
}
return f;
}
// Sample Expected Results (do not change)
myvar = testFun();
myvar[0](); // should alert “sum=0”
myvar[1](); // should alert “sum=2”
testFun(['a'])[2](); // should alert “sum=5”`enter code here
How do I accomplish the third case testFun(['a'])[2]()? Also could my answer from yesterday be written better and what can be improved if so?
