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December 15, 2015 17:00
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Concatenate two arrays and remove duplicate
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| // if no duplicate in the first list | |
| a1.concat( a2.filter( i => a1.indexOf( i ) === -1 ) ); | |
| // if duplicate in the first list | |
| a1.concat( a2 ).reduce( function( p, c, i, a ) { | |
| if ( p.indexOf( c ) === -1 ) p.push( c ); | |
| return p; | |
| }, [] ); |
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