There are occasions when I am unable to successfully execute this script!
var b = [9,8,7,6,5,4,3,2,1];
var a = (function(){
var W = [];
for(var k in b){
W[W.length] = {
index : k,
fx : function(){
console.log(k);
}
}
}
return W;
})();
console.log(a);
for(var j = 0; a[j]; j++)a[j].fx();Why is it not displaying the numerical sequence 987654321 as intended?
Each function you create called fx references the variable k. Instead of saving the current value of k, they only hold a reference to it. As a result, when you execute these functions after the for loop completes, the final value of k is 8, and all functions will output that value.
To prevent this issue and ensure each function has its own variable/value, you can switch from using var k to let k (which is available starting from ECMAScript 6). For more information on let, you can refer to MDN's documentation on let.
var b = [9,8,7,6,5,4,3,2,1];
var a = (function(){
var W = [];
for (let k in b) {
W[W.length] = {
index : k,
fx : function(){
console.log(k);
}
}
}
return W;
})();
for(var j = 0; a[j]; j++)
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