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index.js
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index.js
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module.exports = prop;
function prop(obj, path, value) {
if (!obj) return undefined;
var isGet = arguments.length === 2;
var parts = path;
if (typeof (path) === 'string') {
if (path.charAt(0) === '/') {
// support /a/b/c
parts = path.substr(1).split('/');
} else {
//support a.b.c.
parts = path.split('.');
}
}
var origParts = JSON.parse(JSON.stringify(parts));
parts = parts.reverse();
var target = obj;
var key = parts.pop();
while (parts.length) {
var nextTarget = target[key];
if (!nextTarget) {
if (value === undefined) {
return undefined;
} else {
nextTarget = target[key] = {};
}
}
target = nextTarget;
key = parts.pop();
}
if (isGet) {
return target[key];
}
if (value !== undefined) {
target[key] = value;
return value;
}
delete(target[key]);
if (Object.keys(target).length === 0 && origParts.length > 1) {
// Since the case of recursive delete is infrequent, this is likely performant enough.
origParts.pop();
prop(obj, origParts, undefined);
}
}