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| function subStringBetweenTwo(a, b) { | |
| const arr = a.split(''); | |
| const brr = b.split(''); | |
| return [...new Set(arr.filter(item => brr.includes(item)))] | |
| } | |
| subStringBetweenTwo('Hello', 'World') | |
| // output: ['l', 'o'] | |
| subStringBetweenTwo('Hi', 'World') | |
| // output: [] |
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