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deepMerge.js
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deepMerge.js
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function isMergeableObject(val) {
var nonNullObject = val && typeof val === 'object';
return (
nonNullObject &&
Object.prototype.toString.call(val) !== '[object RegExp]' &&
Object.prototype.toString.call(val) !== '[object Date]'
);
}
function emptyTarget(val) {
return Array.isArray(val) ? [] : {};
}
function cloneIfNecessary(value, optionsArgument) {
var clone = optionsArgument && optionsArgument.clone === true;
return clone && isMergeableObject(value)
? deepmerge(emptyTarget(value), value, optionsArgument)
: value;
}
function defaultArrayMerge(target, source, optionsArgument) {
var destination = target.slice();
source.forEach(function(e, i) {
if (typeof destination[i] === 'undefined') {
destination[i] = cloneIfNecessary(e, optionsArgument);
} else if (isMergeableObject(e)) {
destination[i] = deepmerge(target[i], e, optionsArgument);
} else if (target.indexOf(e) === -1) {
destination.push(cloneIfNecessary(e, optionsArgument));
}
});
return destination;
}
function mergeObject(target, source, optionsArgument) {
var destination = {};
if (isMergeableObject(target)) {
Object.keys(target).forEach(function(key) {
destination[key] = cloneIfNecessary(target[key], optionsArgument);
});
}
Object.keys(source).forEach(function(key) {
if (!isMergeableObject(source[key]) || !target[key]) {
destination[key] = cloneIfNecessary(source[key], optionsArgument);
} else {
destination[key] = deepmerge(target[key], source[key], optionsArgument);
}
});
return destination;
}
function deepmerge(target, source, optionsArgument) {
var array = Array.isArray(source);
var options = optionsArgument || { arrayMerge: defaultArrayMerge };
var arrayMerge = options.arrayMerge || defaultArrayMerge;
if (array) {
return Array.isArray(target)
? arrayMerge(target, source, optionsArgument)
: cloneIfNecessary(source, optionsArgument);
} else {
return mergeObject(target, source, optionsArgument);
}
}
deepmerge.all = function deepmergeAll(array, optionsArgument) {
if (!Array.isArray(array) || array.length < 2) {
throw new Error(
'first argument should be an array with at least two elements',
);
}
// we are sure there are at least 2 values, so it is safe to have no initial value
return array.reduce(function(prev, next) {
return deepmerge(prev, next, optionsArgument);
});
};