I am using JavaScript and I want to check equality of the variable values within if condition. It can check equality of two variables but I don't know how to do it with multiple variables. I like to express it as follows but it wrong. Is there a way to check this?
var a = 2, b = 2, c = 2, d = 2, e = 2, f = 1; if(a == b == c == d == e == f){ console.log("All values are equel"); }else{ console.log("Values are not equel"); } Since equality is a transitive relation, you can:
if(a == b && b == c && c == d && d == e && e == f ){ console.log("All values are equal"); } else { console.log("Not all values are equal"); } You should use if(a == b && a == c && ...)
You could use Array#every and check the values in an array.
var a = 2, b = 2, c = 2, d = 2, e = 2, f = 1; if ([a, b, c, d, e, f].every(function (a, i, aa) { return aa[0] === a; })) { console.log("All values are equal"); } else { console.log("Values are not equal"); }
var a = 2, b = 2, c = 2, d = 2, e = 2, f = 1; if((a == b) && (a ==c) && (a==d) && (a == e) && (a==f) && (b==c) &&(b==d)&&(b==e)&&(b==f)&&(c==d)&&(c==e)&&(c==f)&&(d==f)&&(d==e)&&(d==f)&&(e==f)){ console.log("All values are equel"); }else(){ console.log("Values are not equel"); } You need to compare the variables 2 by 2. So it should be something like
if(a == b && b == c && c == d && d == e && e == f){ your code } 
if (a === b && a === c && ...)if (yourArray.every(function(v) { return v === yourArray[0]; }))