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April 29, 2016 23:29
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Add/remove item to/from array without mutating it
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| // Add item to array | |
| // use concat or spread operator | |
| // Remove item from array | |
| // user slice | |
| // Replace item in array | |
| // | |
| // Source: https://egghead.io/lessons/javascript-redux-avoiding-array-mutations-with-concat-slice-and-spread |
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