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| var x = [ {node: "ip2", app: "dbsyncer", containerId: "1234"}, | |
| {node: "ip2", app: "logforwa", containerId: "3423"}, | |
| {node: "ip4", app: "dbsyncer", containerId: "2213"}, | |
| {node: "ip4", app: "logforwa", containerId: "3434"} ] | |
| var newObj = {}; | |
| x.forEach(function (item) { | |
| newObj[item.node] = newObj[item.node] || []; | |
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| // reduce boils down a list of values into a single value | |
| // var callback = function (previousValue, currentValue, index, array) { | |
| // return previousValue + currentValue | |
| // } | |
| // [].reduce(callback, initialValue) | |
| // | |
| // Reduce invokes the callback on each item in the array. | |
| // On the first invocation, the first item is passed to the callback as currentValue. | |
| // and the initialValue is passed as the previousValue. | |
| // The returned value of that is then passed into the next invocation of the second item as previousValue. |
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