Created
January 3, 2021 14:32
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| const lang = ["Java", "JavaScript"]; | |
| // element found in 1st index | |
| lang.findIndex( (val) => val === "JavaScript" ); // 1 | |
| // element not found so returns -1 | |
| lang.findIndex( (val) => val === "Python" ); // -1 |
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