Array.prototype.indexOf() — Parameters
searchElement : Element to locate in the array. fromIndex {{optional_inline}} : Zero-based index at which to start searching, converted to an integer. Negative index counts back from the end of the array — if -array.length = array.length, the array is not searched and -1 is returned.
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searchElement : Element to locate in the array. fromIndex {{optional_inline}} : Zero-based index at which to start searching, converted to an integer. Negative index counts back from the end of the array — if -array.length = array.length, the array is not searched and -1 is returned.
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MDN Web Docs — files/en-us/web/javascript/reference/global_objects/array/indexof/index.md :: Parameters ↗Revision d14bee540b53 · CC-BY-SA-2.5