Code coverage report for src/indexOf.js

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function indexOf(xs, v) {
    let i = 0;
 
    if (v !== v) { //NaN
        for (let x of xs) {
            if (x !== x) {
                return i;
            }
 
            i += 1;
        }
    } else {
        for (let x of xs) {
            if (x === v) {
                return i;
            }
 
            i += 1;
        }
    }
 
    return -1;
}
 
export default indexOf;