Most checks against an indexOf call against a string or array compare it with -1 because 0 is a valid index. Any checks which look for values >0 ignore the first element, which is likely a bug. If you're merely checking the presence of the string, consider using includes instead. Before using includes method make sure that your browser version is supporting it.

Noncompliant Code Example

var color = "blue";
var name = "ishmael";
var number = 123;

var arr = [color, name];

if (arr.indexOf("blue") > 0) { // Noncompliant
  // ...
}
if (name.indexOf("ish") > 0) { // Noncompliant
  // ...
}

Compliant Solution

var color = "blue";
var name = "ishmael";
var number = 123;

var arr = [color, name];

if (arr.indexOf("blue") >= 0) {
  // ...
}
if (name.includes("ish")) {
  // ...
}

See