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I was going to post this as a comment to palacsint's answer but it helps to have code blocks.

Because you're using this pattern in several places:

for (var prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 ...
 }
}

One way you can reduce the depth of the "arrowing" is to extract that out into its own function:

function iterateMap(obj, fn, scope) {
 for(prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 fn.call(scope || this, prop);
 }
 }
}
...
iterateMap(obj, function(prop) {
 ...
});

I was going to post this as a comment to palacsint's answer but it helps to have code blocks.

Because you're using this pattern in several places:

for (var prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 ...
 }
}

One way you can reduce the depth of the "arrowing" is to extract that out into its own function:

function iterateMap(obj, fn, scope) {
 for(prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 fn.call(scope || this, prop);
 }
 }
}
...
iterateMap(obj, function(prop) {
 ...
});

I was going to post this as a comment to palascint's answer but it helps to have code blocks.

Because you're using this pattern in several places:

for (var prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 ...
 }
}

one way you can reduce the depth of the "arrowing" is to extract that out into its own function:

function iterateMap(obj, fn, scope) {
 for(prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 fn.call(scope || this, prop);
 }
 }
}
...
iterateMap(obj, function(prop) {
 ...
});

I was going to post this as a comment to palacsint's answer but it helps to have code blocks.

Because you're using this pattern in several places:

for (var prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 ...
 }
}

One way you can reduce the depth of the "arrowing" is to extract that out into its own function:

function iterateMap(obj, fn, scope) {
 for(prop in obj) {
 if(obj.hasOwnProperty(prop)) {
 fn.call(scope || this, prop);
 }
 }
}
...
iterateMap(obj, function(prop) {
 ...
});