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dealplustech/dealplustech-astro/node_modules/deep-diff/examples/diff-ignoring-fun.js
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88 lines
2.3 KiB
JavaScript

/*jshint indent:2, laxcomma:true, laxbreak:true*/
var util = require('util')
, deep = require('..')
;
function duckWalk() {
util.log('right step, left-step, waddle');
}
function quadrapedWalk() {
util.log('right hind-step, right fore-step, left hind-step, left fore-step');
}
var duck = {
legs: 2,
walk: duckWalk
};
var dog = {
legs: 4,
walk: quadrapedWalk
};
var diff = deep.diff(duck, dog);
// The differences will include the legs, and walk.
util.log('Differences:\r\n' + util.inspect(diff, false, 9));
// To ignore behavioral differences (functions); use observableDiff and your own accumulator:
var observed = [];
deep.observableDiff(duck, dog, function (d) {
if (d && d.lhs && typeof d.lhs !== 'function') {
observed.push(d);
}
});
util.log('Observed without recording functions:\r\n' + util.inspect(observed, false, 9));
util.log(util.inspect(dog, false, 9) + ' walking: ');
dog.walk();
// The purpose of the observableDiff fn is to allow you to observe and apply differences
// that make sense in your scenario...
// We'll make the dog act like a duck...
deep.observableDiff(dog, duck, function (d) {
deep.applyChange(dog, duck, d);
});
util.log(util.inspect(dog, false, 9) + ' walking: ');
dog.walk();
// Now there are no differences between the duck and the dog:
if (deep.diff(duck, dog)) {
util.log("Ooops, that prior statement seems to be wrong! (but it won't be)");
}
// Now assign an "equivalent" walk function...
dog.walk = function duckWalk() {
util.log('right step, left-step, waddle');
};
if (diff = deep.diff(duck, dog)) {
// The dog's walk function is an equivalent, but different duckWalk function.
util.log('Hrmm, the dog walks differently: ' + util.inspect(diff, false, 9));
}
// Use the observableDiff fn to ingore based on behavioral equivalence...
observed = [];
deep.observableDiff(duck, dog, function (d) {
// if the change is a function, only record it if the text of the fns differ:
if (d && typeof d.lhs === 'function' && typeof d.rhs === 'function') {
var leftFnText = d.lhs.toString();
var rightFnText = d.rhs.toString();
if (leftFnText !== rightFnText) {
observed.push(d);
}
} else {
observed.push(d);
}
});
if (observed.length === 0) {
util.log('Yay!, we detected that the walk functions are equivalent');
}