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avoid creating duplicate of the array called a
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Magne
Magne
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With the arrival of ES6 with sets and splat operator (at the time of being works only in Firefox, check compatibility table), you can write the following one liner:

var a = ['a', 'b', 'c', 'd']; var b = ['a', 'b']; var b1 = new Set(b); var difference = [...new Set([...a]a.filter(x => !b1.has(x)))];

which will result in [ "c", "d" ].

With the arrival of ES6 with sets and splat operator (at the time of being works only in Firefox, check compatibility table), you can write the following one liner:

var a = ['a', 'b', 'c', 'd']; var b = ['a', 'b']; var b1 = new Set(b); var difference = [...new Set([...a].filter(x => !b1.has(x)))];

which will result in [ "c", "d" ].

With the arrival of ES6 with sets and splat operator (at the time of being works only in Firefox, check compatibility table), you can write the following one liner:

var a = ['a', 'b', 'c', 'd']; var b = ['a', 'b']; var b1 = new Set(b); var difference = [...new Set(a.filter(x => !b1.has(x)))];

which will result in [ "c", "d" ].

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Salvador Dali
Salvador Dali
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With the arrival of ES6 with sets and splat operator (at the time of being works only in Firefox, check compatibility table), you can write the following one liner:

var a = ['a', 'b', 'c', 'd']; var b = ['a', 'b']; var b1 = new Set(b); var difference = [...new Set([...a].filter(x => !b1.has(x)))];

which will result in [ "c", "d" ].