Sets the initial execution value for all operations.

import Batch = require("nativescript-batch");

var b = Batch.newBatch(function(ctx) {
    console.log("Value: " + ctx.value);  // 23979
}).then(function(ctx) {
    ctx.setValue(5979);
}).then(function(ctx) {
    console.log("Value: " + ctx.value);  // 5979
}).setValue(23979);

b.start();