NewDash

    Function mergeWith

    • This method is like merge except that it accepts customizer which is invoked to produce the merged values of the destination and source properties. If customizer returns undefined, merging is handled by the method instead. The customizer is invoked with six arguments: (objValue, srcValue, key, object, source, stack).

      Note: This method mutates object.

      Parameters

      • object: any

        The destination object.

      • ...sourcesOrCustomizer: any[]

        The source objects. The function to customize assigned values.

      Returns any

      Returns object.

      5.12.0

      function customizer(objValue, srcValue) {
        if (Array.isArray(objValue)) {
          return objValue.concat(srcValue)
        }
      }

      const object = { 'a': [1], 'b': [2] }
      const other = { 'a': [3], 'b': [4] }

      mergeWith(object, other, customizer)
      // => { 'a': [1, 3], 'b': [2, 4] }

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