Get all gmail threads with google script - scripting

Question

In Google scripts I can get inbox threads by
GmailApp.getInboxThreads(0,100);
but how can I get all threads, last 100, not just in the inbox. Or better yet all threads created yesterday.
Thank you

Answer 1

How about this answer? I think that you can achieve what you want to do using Gmail API. When you use these sample scripts, please enable Gmail API at Advanced Google Services and API console.
Preparation for using sample scripts
Enable Gmail API v1 at Advanced Google Services
On script editor
Resources -> Advanced Google Services
Turn on Gmail API v1
Enable Gmail API at API console
On script editor
Resources -> Cloud Platform project
View API console
At Getting started, click Enable APIs and get credentials like keys.
At left side, click Library.
At Search for APIs & services, input "Gmail". And click Gmail API.
Click Enable button.
If API has already been enabled, please don't turn off.
If now you are opening the script editor with the script for using Gmail API, you can enable Gmail API for the project by accessing this URL https://console.cloud.google.com/apis/api/gmail.googleapis.com/overview
Sample scripts
1. Retrieve 100 threads
var result = Gmail.Users.Threads.list("me", {maxResults:100});
2. Retrieve all threads created before 1 day.
var result = Gmail.Users.Threads.list("me", {q: "newer_than:1d"});
References :
Advanced Google Services
Gmail API
Search operators you can use with Gmail
If this was not useful for you, I'm sorry.