Using indexOf()
we can get index of the first matched array element that matches the specified value. If the value does not exist in the array, -1
is returned. For example:
const arr = ['foo', 'bar', 'baz', 'foo', 'qux']; arr.indexOf('foo'); // 0 arr.indexOf('bar'); // 1 arr.indexOf('baz'); // 2 arr.indexOf('qux'); // 4 arr.indexOf('foobar'); // -1
Similar to indexOf()
, we can make use of lastIndexOf()
to get index of the last matched array element that matches the specified value. For example:
arr.lastIndexOf('foo'); // 3
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